Add step-by-step migration API

drift/lib/internal/versioned_schema.dart

@@ -2,15 +2,15 @@ import 'package:drift/drift.dart';
 
 abstract base class VersionedSchema {
   final DatabaseConnectionUser database;
+  final int version;
 
-  VersionedSchema(this.database);
+  VersionedSchema({required this.database, required this.version});
 
-  DatabaseSchemaEntity lookup(String name, int version) {
+  Iterable<DatabaseSchemaEntity> get entities;
-    return allEntitiesAt(version)
+
-        .singleWhere((element) => element.entityName == name);
+  DatabaseSchemaEntity lookup(String name) {
+    return entities.singleWhere((element) => element.entityName == name);
   }
-
-  Iterable<DatabaseSchemaEntity> allEntitiesAt(int version);
 }
 
 class VersionedTable extends Table with TableInfo<Table, QueryRow> {
@@ -29,6 +29,10 @@ class VersionedTable extends Table with TableInfo<Table, QueryRow> {
   @override
   final List<GeneratedColumn> $columns;
 
+  /// List of columns, represented as a function that returns the generated
+  /// column when given the resolved table name.
+  final List<GeneratedColumn Function(String)> _columnFactories;
+
   @override
   final List<String> customConstraints;
 
@@ -40,10 +44,26 @@ class VersionedTable extends Table with TableInfo<Table, QueryRow> {
     required List<GeneratedColumn Function(String)> columns,
     required List<String> tableConstraints,
     String? alias,
-  })  : customConstraints = tableConstraints,
+  })  : _columnFactories = columns,
+        customConstraints = tableConstraints,
         $columns = [for (final column in columns) column(alias ?? entityName)],
         _alias = alias;
 
+  VersionedTable.aliased({
+    required VersionedTable source,
+    required String? alias,
+  })  : entityName = source.entityName,
+        isStrict = source.isStrict,
+        withoutRowId = source.withoutRowId,
+        attachedDatabase = source.attachedDatabase,
+        customConstraints = source.customConstraints,
+        _columnFactories = source._columnFactories,
+        $columns = [
+          for (final column in source._columnFactories)
+            column(alias ?? source.entityName)
+        ],
+        _alias = alias;
+
   @override
   String get actualTableName => entityName;
 
@@ -53,21 +73,111 @@ class VersionedTable extends Table with TableInfo<Table, QueryRow> {
   @override
   bool get dontWriteConstraints => true;
 
+  @override
+  QueryRow map(Map<String, dynamic> data, {String? tablePrefix}) {
+    return QueryRow(data, attachedDatabase);
+  }
+
   @override
   VersionedTable createAlias(String alias) {
-    return VersionedTable(
+    return VersionedTable.aliased(source: this, alias: alias);
-      entityName: entityName,
+  }
-      isStrict: isStrict,
+}
-      withoutRowId: withoutRowId,
+
-      attachedDatabase: attachedDatabase,
+class VersionedVirtualTable extends VersionedTable
-      columns: $columns,
+    with VirtualTableInfo<Table, QueryRow> {
-      tableConstraints: customConstraints,
+  @override
+  final String moduleAndArgs;
+
+  VersionedVirtualTable({
+    required super.entityName,
+    required super.attachedDatabase,
+    required super.columns,
+    required this.moduleAndArgs,
+    super.alias,
+  }) : super(
+          isStrict: false,
+          withoutRowId: false,
+          tableConstraints: [],
+        );
+
+  VersionedVirtualTable.aliased(
+      {required VersionedVirtualTable source, required String? alias})
+      : moduleAndArgs = source.moduleAndArgs,
+        super.aliased(source: source, alias: alias);
+
+  @override
+  VersionedVirtualTable createAlias(String alias) {
+    return VersionedVirtualTable.aliased(
+      source: this,
       alias: alias,
     );
   }
+}
+
+class VersionedView implements ViewInfo<HasResultSet, QueryRow>, HasResultSet {
+  @override
+  final String entityName;
+  final String? _alias;
+
+  @override
+  final String createViewStmt;
+
+  @override
+  final List<GeneratedColumn> $columns;
+
+  @override
+  late final Map<String, GeneratedColumn> columnsByName = {
+    for (final column in $columns) column.name: column,
+  };
+
+  /// List of columns, represented as a function that returns the generated
+  /// column when given the resolved table name.
+  final List<GeneratedColumn Function(String)> _columnFactories;
+
+  @override
+  final DatabaseConnectionUser attachedDatabase;
+
+  VersionedView({
+    required this.entityName,
+    required this.attachedDatabase,
+    required this.createViewStmt,
+    required List<GeneratedColumn Function(String)> columns,
+    String? alias,
+  })  : _columnFactories = columns,
+        $columns = [for (final column in columns) column(alias ?? entityName)],
+        _alias = alias;
+
+  VersionedView.aliased({required VersionedView source, required String? alias})
+      : entityName = source.entityName,
+        attachedDatabase = source.attachedDatabase,
+        createViewStmt = source.createViewStmt,
+        _columnFactories = source._columnFactories,
+        $columns = [
+          for (final column in source._columnFactories)
+            column(alias ?? source.entityName)
+        ],
+        _alias = alias;
+
+  @override
+  String get aliasedName => _alias ?? entityName;
+
+  @override
+  HasResultSet get asDslTable => this;
+
+  @override
+  VersionedView createAlias(String alias) {
+    return VersionedView.aliased(source: this, alias: alias);
+  }
 
   @override
   QueryRow map(Map<String, dynamic> data, {String? tablePrefix}) {
     return QueryRow(data, attachedDatabase);
   }
+
+  @override
+  Query<HasResultSet, dynamic>? get query => null;
+
+  @override
+  Set<String> get readTables => const {};
 }

drift/lib/src/runtime/query_builder/migration.dart

@@ -49,14 +49,22 @@ class MigrationStrategy {
 /// Runs migrations declared by a [MigrationStrategy].
 class Migrator {
   final GeneratedDatabase _db;
+  final VersionedSchema? _fixedVersion;
 
   /// Used internally by drift when opening the database.
-  Migrator(this._db);
+  Migrator(this._db, [this._fixedVersion]);
+
+  Iterable<DatabaseSchemaEntity> get _allSchemaEntities {
+    return switch (_fixedVersion) {
+      null => _db.allSchemaEntities,
+      var fixed => fixed.entities,
+    };
+  }
 
   /// Creates all tables specified for the database, if they don't exist
   @Deprecated('Use createAll() instead')
   Future<void> createAllTables() async {
-    for (final table in _db.allTables) {
+    for (final table in _allSchemaEntities.whereType<TableInfo>()) {
       await createTable(table);
     }
   }
@@ -64,7 +72,7 @@ class Migrator {
   /// Creates all tables, triggers, views, indexes and everything else defined
   /// in the database, if they don't exist.
   Future<void> createAll() async {
-    for (final entity in _db.allSchemaEntities) {
+    for (final entity in _allSchemaEntities) {
       await create(entity);
     }
   }
@@ -94,7 +102,7 @@ class Migrator {
   /// a view reads from may also warrant re-creating the view to make sure it's
   /// still valid.
   Future<void> recreateAllViews() async {
-    for (final entity in _db.allSchemaEntities) {
+    for (final entity in _allSchemaEntities) {
       if (entity is ViewInfo) {
         await drop(entity);
         await createView(entity);
@@ -119,7 +127,7 @@ class Migrator {
     return _issueCustomQuery(context.sql, context.boundVariables);
   }
 
-  /// Experimental utility method to alter columns of an existing table.
+  /// Alter columns of an existing tabe.
   ///
   /// Since sqlite does not provide a way to alter the type or constraint of an
   /// individual column, one needs to write a fairly complex migration procedure
@@ -141,7 +149,6 @@ class Migrator {
   ///
   /// [other alter]: https://www.sqlite.org/lang_altertable.html#otheralter
   /// [drift docs]: https://drift.simonbinder.eu/docs/advanced-features/migrations/#complex-migrations
-  @experimental
   Future<void> alterTable(TableMigration migration) async {
     final foreignKeysEnabled =
         (await _db.customSelect('PRAGMA foreign_keys').getSingle())
@@ -474,6 +481,22 @@ class Migrator {
   Future<void> _issueCustomQuery(String sql, [List<dynamic>? args]) {
     return _db.customStatement(sql, args);
   }
+
+  @experimental
+  static OnUpgrade stepByStepHelper({
+    required Future<int> Function(
+      int currentVersion,
+      GeneratedDatabase database,
+    ) step,
+  }) {
+    return (m, from, to) async {
+      final database = m._db;
+
+      for (var target = from; target < to;) {
+        target = await step(target, database);
+      }
+    };
+  }
 }
 
 /// Provides information about whether migrations ran before opening the

drift/lib/src/runtime/query_builder/query_builder.dart

@@ -6,6 +6,7 @@ import 'dart:collection';
 import 'dart:typed_data';
 
 import 'package:collection/collection.dart';
+import 'package:drift/internal/versioned_schema.dart';
 import 'package:drift/src/dsl/dsl.dart';
 import 'package:drift/src/runtime/api/options.dart';
 import 'package:drift/src/runtime/api/runtime_api.dart';

drift_dev/lib/src/analysis/results/table.dart

@@ -49,7 +49,7 @@ class DriftTable extends DriftElementWithResultSet {
   /// when creating the `CREATE TABLE` statement at runtime.
   final bool writeDefaultConstraints;
 
-  /// When non-null, the generated table class will override the
+  /// When non-empty, the generated table class will override the
   /// `customConstraints` getter in the table class with this value.
   final List<String> overrideTableConstraints;
 
@@ -169,21 +169,21 @@ class DriftTable extends DriftElementWithResultSet {
       '\$${className}Table';
 }
 
-abstract class DriftTableConstraint {}
+sealed class DriftTableConstraint {}
 
-class UniqueColumns extends DriftTableConstraint {
+final class UniqueColumns extends DriftTableConstraint {
   final Set<DriftColumn> uniqueSet;
 
   UniqueColumns(this.uniqueSet);
 }
 
-class PrimaryKeyColumns extends DriftTableConstraint {
+final class PrimaryKeyColumns extends DriftTableConstraint {
   final Set<DriftColumn> primaryKey;
 
   PrimaryKeyColumns(this.primaryKey);
 }
 
-class ForeignKeyTable extends DriftTableConstraint {
+final class ForeignKeyTable extends DriftTableConstraint {
   final List<DriftColumn> localColumns;
   final DriftTable otherTable;
 
@@ -214,6 +214,12 @@ class VirtualTableData {
 
   final RecognizedVirtualTableModule? recognized;
 
+  /// The module and the arguments in a single string, suitable for `CREATE
+  /// VIRTUAL TABLE` statements.
+  String get moduleAndArgs {
+    return '$module(${moduleArguments.join(', ')})';
+  }
+
   VirtualTableData(this.module, this.moduleArguments, this.recognized);
 }
 

drift_dev/lib/src/cli/commands/schema.dart

@@ -10,7 +10,7 @@ import 'schema/dump.dart';
 import 'schema/generate_utils.dart';
 
 import '../cli.dart';
-import 'schema/versions.dart';
+import 'schema/steps.dart';
 
 class SchemaCommand extends Command {
   @override

drift_dev/lib/src/cli/commands/schema/steps.dart

@@ -18,7 +18,7 @@ class WriteVersions extends Command {
   WriteVersions(this.cli);
 
   @override
-  String get name => 'versions';
+  String get name => 'steps';
 
   @override
   String get description =>
@@ -26,7 +26,7 @@ class WriteVersions extends Command {
 
   @override
   String get invocation {
-    return '${runner!.executableName} schema versions <schema directory> <output file>';
+    return '${runner!.executableName} schema steps <schema directory> <output file>';
   }
 
   @override

drift_dev/lib/src/writer/schema_version_writer.dart

@@ -1,4 +1,7 @@
 import 'package:collection/collection.dart';
+import 'package:drift/drift.dart' show DriftSqlType;
+import 'package:sqlparser/sqlparser.dart' as sql;
+import 'package:sqlparser/utils/node_to_text.dart';
 
 import '../analysis/results/results.dart';
 import '../utils/string_escaper.dart';
@@ -13,60 +16,231 @@ class SchemaVersion {
   SchemaVersion(this.version, this.schema, this.options);
 }
 
+enum _ResultSetKind {
+  table,
+  virtualTable,
+  view,
+}
+
+final class _TableShape {
+  final _ResultSetKind kind;
+  // Map from Dart getter names to column names in SQL and the SQL type.
+  final Map<String, (String, DriftSqlType)> columnTypes;
+
+  _TableShape(this.kind, this.columnTypes);
+
+  @override
+  int get hashCode => Object.hash(kind, _equality.hash(columnTypes));
+
+  @override
+  bool operator ==(Object other) {
+    return other is _TableShape &&
+        other.kind == kind &&
+        _equality.equals(other.columnTypes, columnTypes);
+  }
+
+  static const _equality = MapEquality<String, (String, DriftSqlType)>();
+
+  static Map<String, (String, DriftSqlType)> columnsFrom(
+      DriftElementWithResultSet e) {
+    return {
+      for (final column in e.columns)
+        column.nameInDart: (column.nameInSql, column.sqlType),
+    };
+  }
+}
+
 class SchemaVersionWriter {
   static final Uri _schemaLibrary =
       Uri.parse('package:drift/internal/versioned_schema.dart');
 
   /// All schema versions, sorted by [SchemaVersion.version].
   final List<SchemaVersion> versions;
-  final Scope scope;
+  final Scope libraryScope;
 
   final Map<String, String> _columnCodeToFactory = {};
+  final Map<_TableShape, String> _shapes = {};
 
-  /// All schema entities across all versions are put in a single list, sorted
+  SchemaVersionWriter(this.versions, this.libraryScope);
-  /// by their schema version.
-  ///
-  /// By keeping a start and end-index pair for each schema, we can efficiently
-  /// find all schema entities for a given version at runtime.
-  final rangesForVersion = <(int, int)>[];
-
-  SchemaVersionWriter(this.versions, this.scope);
 
   String _referenceColumn(DriftColumn column) {
-    final text = scope.leaf();
+    final text = libraryScope.leaf();
     final (type, code) = TableOrViewWriter.instantiateColumn(column, text);
 
     return _columnCodeToFactory.putIfAbsent(code, () {
-      final methodName = 'column_${_columnCodeToFactory.length}';
+      final methodName = '_column_${_columnCodeToFactory.length}';
-      text.write('$type $methodName(String aliasedName) => $code;');
+      text.writeln('$type $methodName(String aliasedName) => $code;');
       return methodName;
     });
   }
 
-  void _writeTable(DriftTable table, TextEmitter writer) {
+  void _writeColumnsArgument(List<DriftColumn> columns, TextEmitter writer) {
-    writer
+    writer.write('columns: [');
-      ..writeUriRef(_schemaLibrary, 'VersionedTable(')
-      ..write('entityName: ${asDartLiteral(table.schemaName)},')
-      ..write('withoutRowId: ${table.withoutRowId},')
-      ..write('isStrict: ${table.strict},')
-      ..write('attachedDatabase: database,')
-      ..write('columns: [');
 
-    for (final column in table.columns) {
+    for (final column in columns) {
       writer
         ..write(_referenceColumn(column))
         ..write(',');
     }
 
-    writer
+    writer.write('],');
-      ..write('],')
-      ..write('tableConstraints: [],')
-      ..write(')');
   }
 
-  void _writeEntity(DriftSchemaElement element, TextEmitter writer) {
+  String _shapeClass(DriftElementWithResultSet resultSet) {
-    if (element is DriftTable) {
+    final (kind, superclass) = switch (resultSet) {
-      _writeTable(element, writer);
+      DriftTable(virtualTableData: null) => (
+          _ResultSetKind.table,
+          'VersionedTable'
+        ),
+      DriftTable() => (_ResultSetKind.virtualTable, 'VersionedVirtualTable'),
+      DriftView() => (_ResultSetKind.view, 'VersionedView'),
+      _ => throw ArgumentError.value(resultSet, 'resultSet', 'Unknown type'),
+    };
+
+    final shape = _TableShape(kind, _TableShape.columnsFrom(resultSet));
+    return _shapes.putIfAbsent(shape, () {
+      final className = 'Shape${_shapes.length}';
+      final classWriter = libraryScope.leaf();
+
+      classWriter
+        ..write('class $className extends ')
+        ..writeUriRef(_schemaLibrary, superclass)
+        ..writeln('{')
+        ..writeln(
+            '$className({required super.source, required super.alias}) : super.aliased();');
+
+      for (final MapEntry(key: getterName, value: (sqlName, type))
+          in shape.columnTypes.entries) {
+        final columnType = AnnotatedDartCode([dartTypeNames[type]!]);
+
+        classWriter
+          ..writeDriftRef('GeneratedColumn<')
+          ..writeDart(columnType)
+          ..write('> get ')
+          ..write(getterName)
+          ..write(' => columnsByName[${asDartLiteral(sqlName)}]! as ')
+          ..writeDriftRef('GeneratedColumn<')
+          ..writeDart(columnType)
+          ..writeln('>;');
+      }
+
+      classWriter.writeln('}');
+
+      return className;
+    });
+  }
+
+  void _writeWithResultSet(DriftElementWithResultSet entity, Scope classScope,
+      TextEmitter intoListWriter) {
+    final getterName = entity.dbGetterName;
+    final shape = _shapeClass(entity);
+    final writer = classScope.leaf()
+      ..write('late final $shape $getterName = ')
+      ..write('$shape(source: ');
+
+    switch (entity) {
+      case DriftTable():
+        if (entity.isVirtual) {
+          final info = entity.virtualTableData!;
+
+          writer
+            ..writeUriRef(_schemaLibrary, 'VersionedVirtualTable(')
+            ..write('entityName: ${asDartLiteral(entity.schemaName)},')
+            ..write('moduleAndArgs: ${asDartLiteral(info.moduleAndArgs)},');
+        } else {
+          final tableConstraints = <String>[];
+
+          if (entity.writeDefaultConstraints) {
+            // We don't override primaryKey and uniqueKey in generated table
+            // classes to keep the code shorter. The migrator would use those
+            // getters to generate SQL at runtime, which means that this burden
+            // now falls onto the generator.
+            for (final constraint in entity.tableConstraints) {
+              final astNode = switch (constraint) {
+                PrimaryKeyColumns(primaryKey: var columns) => sql.KeyClause(
+                    null,
+                    isPrimaryKey: true,
+                    columns: [
+                      for (final column in columns)
+                        sql.IndexedColumn(
+                            sql.Reference(columnName: column.nameInSql))
+                    ],
+                  ),
+                UniqueColumns(uniqueSet: var columns) => sql.KeyClause(
+                    null,
+                    isPrimaryKey: false,
+                    columns: [
+                      for (final column in columns)
+                        sql.IndexedColumn(
+                            sql.Reference(columnName: column.nameInSql))
+                    ],
+                  ),
+                ForeignKeyTable() => sql.ForeignKeyTableConstraint(
+                    null,
+                    columns: [
+                      for (final column in constraint.localColumns)
+                        sql.Reference(columnName: column.nameInSql)
+                    ],
+                    clause: sql.ForeignKeyClause(
+                      foreignTable:
+                          sql.TableReference(constraint.otherTable.schemaName),
+                      columnNames: [
+                        for (final column in constraint.otherColumns)
+                          sql.Reference(columnName: column.nameInSql)
+                      ],
+                      onUpdate: constraint.onUpdate,
+                      onDelete: constraint.onDelete,
+                    ),
+                  ),
+              };
+
+              tableConstraints.add(astNode.toSql());
+            }
+          }
+          tableConstraints.addAll(entity.overrideTableConstraints.toList());
+
+          writer
+            ..writeUriRef(_schemaLibrary, 'VersionedTable(')
+            ..write('entityName: ${asDartLiteral(entity.schemaName)},')
+            ..write('withoutRowId: ${entity.withoutRowId},')
+            ..write('isStrict: ${entity.strict},')
+            ..write('tableConstraints: [');
+
+          for (final constraint in tableConstraints) {
+            writer
+              ..write(asDartLiteral(constraint))
+              ..write(',');
+          }
+
+          writer.write('],');
+        }
+        break;
+      case DriftView():
+        final source = entity.source as SqlViewSource;
+
+        writer
+          ..writeUriRef(_schemaLibrary, 'VersionedView(')
+          ..write('entityName: ${asDartLiteral(entity.schemaName)},')
+          ..write(
+              'createViewStmt: ${asDartLiteral(source.sqlCreateViewStmt)},');
+
+        break;
+    }
+
+    _writeColumnsArgument(entity.columns, writer);
+    writer.write('attachedDatabase: database,');
+    writer.write('), alias: null);');
+
+    intoListWriter.write(getterName);
+  }
+
+  void _writeEntity({
+    required DriftSchemaElement element,
+    required Scope classScope,
+    required TextEmitter writer,
+  }) {
+    if (element is DriftElementWithResultSet) {
+      _writeWithResultSet(element, classScope, writer);
     } else if (element is DriftIndex) {
       writer
         ..writeDriftRef('Index(')
@@ -86,68 +260,92 @@ class SchemaVersionWriter {
     }
   }
 
-  void _implementAllEntitiesAt(TextEmitter writer) {
-    writer
-      ..writeln('@override')
-      ..write('Iterable<')
-      ..writeDriftRef('DatabaseSchemaEntity')
-      ..writeln('> allEntitiesAt(int version) {')
-      ..writeln('int start, count;')
-      ..writeln('switch (version) {');
-
-    versions.forEachIndexed((index, schema) {
-      final (start, end) = rangesForVersion[index];
-
-      writer
-        ..writeln('case ${schema.version}:')
-        ..writeln('start = $start;')
-        ..writeln('count = ${end - start};');
-    });
-
-    writer
-      ..writeln('default:')
-      ..writeln(r"throw ArgumentError('Unknown schema version $version');");
-
-    writer
-      ..writeln('}')
-      ..writeln('return entities.skip(start).take(count);')
-      ..writeln('}');
-  }
-
   void write() {
-    final classWriter = scope.leaf();
-
-    classWriter
-      ..write('final class VersionedSchema extends ')
-      ..writeUriRef(_schemaLibrary, 'VersionedSchema')
-      ..writeln('{')
-      ..writeln('VersionedSchema(super.database);');
-
-    var currentIndex = 0;
-    classWriter
-      ..write('late final ')
-      ..writeUriRef(AnnotatedDartCode.dartCore, 'List')
-      ..write('<')
-      ..writeDriftRef('DatabaseSchemaEntity')
-      ..write('> entities = [');
-
     for (final version in versions) {
-      classWriter.writeln(' // VERSION ${version.version}');
+      final versionNo = version.version;
-      final startIndex = currentIndex;
+      final versionClass = '_S$versionNo';
+      final versionScope = libraryScope.child();
+
+      versionScope.leaf()
+        ..write('final class $versionClass extends ')
+        ..writeUriRef(_schemaLibrary, 'VersionedSchema')
+        ..writeln('{')
+        ..writeln('$versionClass({required super.database}): '
+            'super(version: $versionNo);');
+
+      final allEntitiesWriter = versionScope.leaf()
+        ..write('@override')
+        ..write(' late final ')
+        ..writeUriRef(AnnotatedDartCode.dartCore, 'List')
+        ..write('<')
+        ..writeDriftRef('DatabaseSchemaEntity')
+        ..write('> entities = [');
 
       for (final entity in version.schema) {
-        _writeEntity(entity, classWriter);
+        _writeEntity(
-        classWriter.writeln(',');
+          element: entity,
-        currentIndex++;
+          classScope: versionScope,
+          writer: allEntitiesWriter,
+        );
+        allEntitiesWriter.write(',');
       }
 
-      final endIndex = currentIndex;
+      allEntitiesWriter.write('];');
-      rangesForVersion.add((startIndex, endIndex));
+      versionScope.leaf().writeln('}');
     }
-    classWriter.write('];');
 
-    _implementAllEntitiesAt(classWriter);
+    final stepByStep = libraryScope.leaf()
+      ..writeDriftRef('OnUpgrade')
+      ..write(' stepByStep({');
 
-    classWriter.writeln('}');
+    for (final (current, next) in versions.withNext) {
+      stepByStep
+        ..write('required Future<void> Function(')
+        ..writeDriftRef('Migrator')
+        ..write(' m, _S${next.version} schema)')
+        ..writeln('from${current.version}To${next.version},');
+    }
+
+    stepByStep
+      ..writeln('}) {')
+      ..write('return ')
+      ..writeDriftRef('Migrator')
+      ..writeln('.stepByStepHelper(step: (currentVersion, database) async {')
+      ..writeln('switch (currentVersion) {');
+
+    for (final (current, next) in versions.withNext) {
+      stepByStep
+        ..writeln('case ${current.version}:')
+        ..write('final schema = _S${next.version}(database: database);')
+        ..write('final migrator = ')
+        ..writeDriftRef('Migrator')
+        ..writeln('(database, schema);')
+        ..writeln(
+            'await from${current.version}To${next.version}(migrator, schema);')
+        ..writeln('return ${next.version};');
+    }
+
+    stepByStep
+      ..writeln(
+          r"default: throw ArgumentError.value('Unknown migration from $currentVersion');")
+      ..writeln('}') // End of switch
+      ..writeln('}') // End of stepByStepHelper function
+      ..writeln(');') // End of stepByStepHelper call
+      ..writeln('}'); // End of method
+  }
+}
+
+extension<T> on Iterable<T> {
+  Iterable<(T, T)> get withNext sync* {
+    final iterator = this.iterator;
+    if (!iterator.moveNext()) return;
+
+    var a = iterator.current;
+    while (iterator.moveNext()) {
+      var b = iterator.current;
+      yield (a, b);
+
+      a = b;
+    }
   }
 }

drift_dev/lib/src/writer/tables/table_writer.dart

@@ -598,8 +598,7 @@ class TableWriter extends TableOrViewWriter {
 
     if (table.isVirtual) {
       final stmt = table.virtualTableData!;
-      final moduleAndArgs =
+      final moduleAndArgs = asDartLiteral(stmt.moduleAndArgs);
-          asDartLiteral('${stmt.module}(${stmt.moduleArguments.join(', ')})');
       buffer
         ..write('@override\n')
         ..write('String get moduleAndArgs => $moduleAndArgs;\n');

examples/migrations_example/README.md

@@ -20,9 +20,9 @@ Run
 dart run drift_dev schema generate drift_migrations/ test/generated/ --data-classes --companions
 ```
 
-We're also using test code inside `lib/` to run migrations with older definitions of tables.
+Since we're using the step-by-step generator to make writing migrations easier, this command
-This isn't required for all migrations, but can be useful in some cases.
+is used to generate a helper file in `lib/`:
 
 ```
-dart run drift_dev schema generate drift_migrations/ lib/src/generated
+dart run drift_dev schema steps drift_migrations/ lib/src/versions.dart
 ```

examples/migrations_example/lib/database.dart

@@ -2,9 +2,7 @@ import 'package:drift/drift.dart';
 import 'package:drift_dev/api/migrations.dart';
 
 import 'tables.dart';
-import 'src/generated/schema_v2.dart' as v2;
+import 'src/versions.dart';
-import 'src/generated/schema_v4.dart' as v4;
-import 'src/generated/schema_v8.dart' as v8;
 
 part 'database.g.dart';
 
@@ -20,59 +18,7 @@ class Database extends _$Database {
   @override
   MigrationStrategy get migration {
     return MigrationStrategy(
-      onUpgrade: (m, before, now) async {
+      onUpgrade: _upgrade,
-        for (var target = before + 1; target <= now; target++) {
-          switch (target) {
-            case 2:
-              // Migration from 1 to 2: Add name column in users. Use "no name"
-              // as a default value.
-              final usersAtV2 = v2.Users(this);
-
-              await m.alterTable(
-                TableMigration(
-                  usersAtV2,
-                  columnTransformer: {
-                    users.name: const Constant<String>('no name'),
-                  },
-                  newColumns: [usersAtV2.name],
-                ),
-              );
-              break;
-            case 3:
-              // Migration from 2 to 3: We added the groups table
-              await m.createTable(groups);
-              break;
-            case 4:
-              // Migration from 3 to 4: users.name now has a default value
-              // No need to transform any data, just re-create the table
-              final usersAtV4 = v4.Users(this);
-
-              await m.alterTable(TableMigration(usersAtV4));
-              break;
-            case 5:
-              // Just add a new column that was added in version 5;
-              await m.addColumn(users, users.nextUser);
-
-              // And create the view on users
-              await m.createView(groupCount);
-              break;
-            case 6:
-              await m.addColumn(users, users.birthday);
-              break;
-            case 7:
-              await m.createTable(notes);
-              break;
-            case 8:
-              // Added a unique key to the users table
-              await m.alterTable(TableMigration(v8.Users(this)));
-              break;
-            case 9:
-              // Added a check to the users table
-              await m.alterTable(TableMigration(users));
-              break;
-          }
-        }
-      },
       beforeOpen: (details) async {
         // For Flutter apps, this should be wrapped in an if (kDebugMode) as
         // suggested here: https://drift.simonbinder.eu/docs/advanced-features/migrations/#verifying-a-database-schema-at-runtime
@@ -80,4 +26,50 @@ class Database extends _$Database {
       },
     );
   }
+
+  static final _upgrade = stepByStep(
+    from1To2: (m, schema) async {
+      // Migration from 1 to 2: Add name column in users. Use "no name"
+      // as a default value.
+
+      await m.alterTable(
+        TableMigration(
+          schema.users,
+          columnTransformer: {
+            schema.users.name: const Constant<String>('no name'),
+          },
+          newColumns: [schema.users.name],
+        ),
+      );
+    },
+    from2To3: (m, schema) async => m.createTable(schema.groups),
+    from3To4: (m, schema) async {
+      // Migration from 3 to 4: users.name now has a default value
+      // No need to transform any data, just re-create the table
+      final usersAtV4 = schema.users;
+
+      await m.alterTable(TableMigration(usersAtV4));
+    },
+    from4To5: (m, schema) async {
+      // Just add a new column that was added in version 5;
+      await m.addColumn(schema.users, schema.users.nextUser);
+
+      // And create the view on users
+      await m.createView(schema.groupCount);
+    },
+    from5To6: (m, schema) async {
+      await m.addColumn(schema.users, schema.users.birthday);
+    },
+    from6To7: (m, schema) async {
+      await m.createTable(schema.notes);
+    },
+    from7To8: (m, schema) async {
+      // Added a unique key to the users table
+      await m.alterTable(TableMigration(schema.users));
+    },
+    from8To9: (m, schema) async {
+      // Added a check to the users table
+      await m.alterTable(TableMigration(schema.users));
+    },
+  );
 }

examples/migrations_example/lib/database.g.dart

@@ -874,7 +874,7 @@ class GroupCount extends ViewInfo<GroupCount, GroupCountData>
   @override
   Query? get query => null;
   @override
-  Set<String> get readTables => const {'groups', 'users'};
+  Set<String> get readTables => const {'users', 'groups'};
 }
 
 abstract class _$Database extends GeneratedDatabase {

examples/migrations_example/lib/src/generated/schema.dart

@@ -1,43 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-import 'package:drift/internal/migrations.dart';
-import 'schema_v1.dart' as v1;
-import 'schema_v2.dart' as v2;
-import 'schema_v3.dart' as v3;
-import 'schema_v4.dart' as v4;
-import 'schema_v5.dart' as v5;
-import 'schema_v6.dart' as v6;
-import 'schema_v7.dart' as v7;
-import 'schema_v8.dart' as v8;
-import 'schema_v9.dart' as v9;
-
-class GeneratedHelper implements SchemaInstantiationHelper {
-  @override
-  GeneratedDatabase databaseForVersion(QueryExecutor db, int version) {
-    switch (version) {
-      case 1:
-        return v1.DatabaseAtV1(db);
-      case 2:
-        return v2.DatabaseAtV2(db);
-      case 3:
-        return v3.DatabaseAtV3(db);
-      case 4:
-        return v4.DatabaseAtV4(db);
-      case 5:
-        return v5.DatabaseAtV5(db);
-      case 6:
-        return v6.DatabaseAtV6(db);
-      case 7:
-        return v7.DatabaseAtV7(db);
-      case 8:
-        return v8.DatabaseAtV8(db);
-      case 9:
-        return v9.DatabaseAtV9(db);
-      default:
-        throw MissingSchemaException(
-            version, const {1, 2, 3, 4, 5, 6, 7, 8, 9});
-    }
-  }
-}

examples/migrations_example/lib/src/generated/schema_v1.dart

@@ -1,47 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  @override
-  List<GeneratedColumn> get $columns => [id];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class DatabaseAtV1 extends GeneratedDatabase {
-  DatabaseAtV1(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities => [users];
-  @override
-  int get schemaVersion => 1;
-}

examples/migrations_example/lib/src/generated/schema_v2.dart

@@ -1,50 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string, requiredDuringInsert: true);
-  @override
-  List<GeneratedColumn> get $columns => [id, name];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class DatabaseAtV2 extends GeneratedDatabase {
-  DatabaseAtV2(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities => [users];
-  @override
-  int get schemaVersion => 2;
-}

examples/migrations_example/lib/src/generated/schema_v3.dart

@@ -1,101 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string, requiredDuringInsert: true);
-  @override
-  List<GeneratedColumn> get $columns => [id, name];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class DatabaseAtV3 extends GeneratedDatabase {
-  DatabaseAtV3(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities => [users, groups];
-  @override
-  int get schemaVersion => 3;
-}

examples/migrations_example/lib/src/generated/schema_v4.dart

@@ -1,103 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class DatabaseAtV4 extends GeneratedDatabase {
-  DatabaseAtV4(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities => [users, groups];
-  @override
-  int get schemaVersion => 4;
-}

examples/migrations_example/lib/src/generated/schema_v5.dart

@@ -1,154 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('REFERENCES users (id)'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name, nextUser];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
-  final String? _alias;
-  @override
-  final DatabaseAtV5 attachedDatabase;
-  GroupCount(this.attachedDatabase, [this._alias]);
-  @override
-  List<GeneratedColumn> get $columns => [id, name, nextUser, groupCount];
-  @override
-  String get aliasedName => _alias ?? entityName;
-  @override
-  String get entityName => 'group_count';
-  @override
-  String get createViewStmt =>
-      'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users';
-  @override
-  GroupCount get asDslTable => this;
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  late final GeneratedColumn<int> id =
-      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int);
-  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
-      'group_count', aliasedName, false,
-      type: DriftSqlType.int);
-  @override
-  GroupCount createAlias(String alias) {
-    return GroupCount(attachedDatabase, alias);
-  }
-
-  @override
-  Query? get query => null;
-  @override
-  Set<String> get readTables => const {};
-}
-
-class DatabaseAtV5 extends GeneratedDatabase {
-  DatabaseAtV5(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  late final GroupCount groupCount = GroupCount(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [users, groups, groupCount];
-  @override
-  int get schemaVersion => 5;
-}

examples/migrations_example/lib/src/generated/schema_v6.dart

@@ -1,164 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime, requiredDuringInsert: false);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('REFERENCES users (id)'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
-  final String? _alias;
-  @override
-  final DatabaseAtV6 attachedDatabase;
-  GroupCount(this.attachedDatabase, [this._alias]);
-  @override
-  List<GeneratedColumn> get $columns =>
-      [id, name, birthday, nextUser, groupCount];
-  @override
-  String get aliasedName => _alias ?? entityName;
-  @override
-  String get entityName => 'group_count';
-  @override
-  String get createViewStmt =>
-      'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users';
-  @override
-  GroupCount get asDslTable => this;
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  late final GeneratedColumn<int> id =
-      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string);
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int);
-  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
-      'group_count', aliasedName, false,
-      type: DriftSqlType.int);
-  @override
-  GroupCount createAlias(String alias) {
-    return GroupCount(attachedDatabase, alias);
-  }
-
-  @override
-  Query? get query => null;
-  @override
-  Set<String> get readTables => const {};
-}
-
-class DatabaseAtV6 extends GeneratedDatabase {
-  DatabaseAtV6(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  late final GroupCount groupCount = GroupCount(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [users, groups, groupCount];
-  @override
-  int get schemaVersion => 6;
-  @override
-  DriftDatabaseOptions get options =>
-      const DriftDatabaseOptions(storeDateTimeAsText: true);
-}

examples/migrations_example/lib/src/generated/schema_v7.dart

@@ -1,208 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime, requiredDuringInsert: false);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('REFERENCES users (id)'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
-  final String? _alias;
-  @override
-  final DatabaseAtV7 attachedDatabase;
-  GroupCount(this.attachedDatabase, [this._alias]);
-  @override
-  List<GeneratedColumn> get $columns =>
-      [id, name, birthday, nextUser, groupCount];
-  @override
-  String get aliasedName => _alias ?? entityName;
-  @override
-  String get entityName => 'group_count';
-  @override
-  String get createViewStmt =>
-      'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users';
-  @override
-  GroupCount get asDslTable => this;
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  late final GeneratedColumn<int> id =
-      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string);
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int);
-  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
-      'group_count', aliasedName, false,
-      type: DriftSqlType.int);
-  @override
-  GroupCount createAlias(String alias) {
-    return GroupCount(attachedDatabase, alias);
-  }
-
-  @override
-  Query? get query => null;
-  @override
-  Set<String> get readTables => const {};
-}
-
-class Notes extends Table with TableInfo, VirtualTableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Notes(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> content = GeneratedColumn<String>(
-      'content', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> searchTerms = GeneratedColumn<String>(
-      'search_terms', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  @override
-  List<GeneratedColumn> get $columns => [title, content, searchTerms];
-  @override
-  String get aliasedName => _alias ?? 'notes';
-  @override
-  String get actualTableName => 'notes';
-  @override
-  Set<GeneratedColumn> get $primaryKey => const {};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Notes createAlias(String alias) {
-    return Notes(attachedDatabase, alias);
-  }
-
-  @override
-  String get moduleAndArgs =>
-      'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")';
-}
-
-class DatabaseAtV7 extends GeneratedDatabase {
-  DatabaseAtV7(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  late final GroupCount groupCount = GroupCount(this);
-  late final Notes notes = Notes(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [users, groups, groupCount, notes];
-  @override
-  int get schemaVersion => 7;
-  @override
-  DriftDatabaseOptions get options =>
-      const DriftDatabaseOptions(storeDateTimeAsText: true);
-}

examples/migrations_example/lib/src/generated/schema_v8.dart

@@ -1,212 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime, requiredDuringInsert: false);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('REFERENCES "users" ("id")'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  List<Set<GeneratedColumn>> get uniqueKeys => [
-        {name, birthday},
-      ];
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression<bool>('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users (id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
-  final String? _alias;
-  @override
-  final DatabaseAtV8 attachedDatabase;
-  GroupCount(this.attachedDatabase, [this._alias]);
-  @override
-  List<GeneratedColumn> get $columns =>
-      [id, name, birthday, nextUser, groupCount];
-  @override
-  String get aliasedName => _alias ?? entityName;
-  @override
-  String get entityName => 'group_count';
-  @override
-  String get createViewStmt =>
-      'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users';
-  @override
-  GroupCount get asDslTable => this;
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  late final GeneratedColumn<int> id =
-      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string);
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int);
-  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
-      'group_count', aliasedName, false,
-      type: DriftSqlType.int);
-  @override
-  GroupCount createAlias(String alias) {
-    return GroupCount(attachedDatabase, alias);
-  }
-
-  @override
-  Query? get query => null;
-  @override
-  Set<String> get readTables => const {};
-}
-
-class Notes extends Table with TableInfo, VirtualTableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Notes(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> content = GeneratedColumn<String>(
-      'content', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> searchTerms = GeneratedColumn<String>(
-      'search_terms', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  @override
-  List<GeneratedColumn> get $columns => [title, content, searchTerms];
-  @override
-  String get aliasedName => _alias ?? 'notes';
-  @override
-  String get actualTableName => 'notes';
-  @override
-  Set<GeneratedColumn> get $primaryKey => const {};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Notes createAlias(String alias) {
-    return Notes(attachedDatabase, alias);
-  }
-
-  @override
-  String get moduleAndArgs =>
-      'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")';
-}
-
-class DatabaseAtV8 extends GeneratedDatabase {
-  DatabaseAtV8(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  late final GroupCount groupCount = GroupCount(this);
-  late final Notes notes = Notes(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [users, groups, groupCount, notes];
-  @override
-  int get schemaVersion => 8;
-  @override
-  DriftDatabaseOptions get options =>
-      const DriftDatabaseOptions(storeDateTimeAsText: true);
-}

examples/migrations_example/lib/src/generated/schema_v9.dart

@@ -1,215 +0,0 @@
-// GENERATED CODE, DO NOT EDIT BY HAND.
-// ignore_for_file: type=lint
-//@dart=2.12
-import 'package:drift/drift.dart';
-
-class Users extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Users(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      hasAutoIncrement: true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: false,
-      defaultValue: const Constant('name'));
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime, requiredDuringInsert: false);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      defaultConstraints:
-          GeneratedColumn.constraintIsAlways('REFERENCES users (id)'));
-  @override
-  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
-  @override
-  String get aliasedName => _alias ?? 'users';
-  @override
-  String get actualTableName => 'users';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  List<Set<GeneratedColumn>> get uniqueKeys => [
-        {name, birthday},
-      ];
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Users createAlias(String alias) {
-    return Users(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['CHECK (LENGTH(name) < 10)'];
-}
-
-class Groups extends Table with TableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Groups(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
-      'id', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: false,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL');
-  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
-      'deleted', aliasedName, true,
-      type: DriftSqlType.bool,
-      requiredDuringInsert: false,
-      $customConstraints: 'DEFAULT FALSE',
-      defaultValue: const CustomExpression('FALSE'));
-  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
-      'owner', aliasedName, false,
-      type: DriftSqlType.int,
-      requiredDuringInsert: true,
-      $customConstraints: 'NOT NULL REFERENCES users(id)');
-  @override
-  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
-  @override
-  String get aliasedName => _alias ?? 'groups';
-  @override
-  String get actualTableName => 'groups';
-  @override
-  Set<GeneratedColumn> get $primaryKey => {id};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Groups createAlias(String alias) {
-    return Groups(attachedDatabase, alias);
-  }
-
-  @override
-  List<String> get customConstraints => const ['PRIMARY KEY(id)'];
-  @override
-  bool get dontWriteConstraints => true;
-}
-
-class Notes extends Table with TableInfo, VirtualTableInfo {
-  @override
-  final GeneratedDatabase attachedDatabase;
-  final String? _alias;
-  Notes(this.attachedDatabase, [this._alias]);
-  late final GeneratedColumn<String> title = GeneratedColumn<String>(
-      'title', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> content = GeneratedColumn<String>(
-      'content', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  late final GeneratedColumn<String> searchTerms = GeneratedColumn<String>(
-      'search_terms', aliasedName, false,
-      type: DriftSqlType.string,
-      requiredDuringInsert: true,
-      $customConstraints: '');
-  @override
-  List<GeneratedColumn> get $columns => [title, content, searchTerms];
-  @override
-  String get aliasedName => _alias ?? 'notes';
-  @override
-  String get actualTableName => 'notes';
-  @override
-  Set<GeneratedColumn> get $primaryKey => const {};
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  @override
-  Notes createAlias(String alias) {
-    return Notes(attachedDatabase, alias);
-  }
-
-  @override
-  String get moduleAndArgs =>
-      'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")';
-}
-
-class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
-  final String? _alias;
-  @override
-  final DatabaseAtV9 attachedDatabase;
-  GroupCount(this.attachedDatabase, [this._alias]);
-  @override
-  List<GeneratedColumn> get $columns =>
-      [id, name, birthday, nextUser, groupCount];
-  @override
-  String get aliasedName => _alias ?? entityName;
-  @override
-  String get entityName => 'group_count';
-  @override
-  String get createViewStmt =>
-      'CREATE VIEW group_count AS SELECT\n    users.*,\n    (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count\n  FROM users;';
-  @override
-  GroupCount get asDslTable => this;
-  @override
-  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
-    throw UnsupportedError('TableInfo.map in schema verification code');
-  }
-
-  late final GeneratedColumn<int> id =
-      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
-  late final GeneratedColumn<String> name = GeneratedColumn<String>(
-      'name', aliasedName, false,
-      type: DriftSqlType.string);
-  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
-      'birthday', aliasedName, true,
-      type: DriftSqlType.dateTime);
-  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
-      'next_user', aliasedName, true,
-      type: DriftSqlType.int);
-  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
-      'group_count', aliasedName, false,
-      type: DriftSqlType.int);
-  @override
-  GroupCount createAlias(String alias) {
-    return GroupCount(attachedDatabase, alias);
-  }
-
-  @override
-  Query? get query => null;
-  @override
-  Set<String> get readTables => const {};
-}
-
-class DatabaseAtV9 extends GeneratedDatabase {
-  DatabaseAtV9(QueryExecutor e) : super(e);
-  late final Users users = Users(this);
-  late final Groups groups = Groups(this);
-  late final Notes notes = Notes(this);
-  late final GroupCount groupCount = GroupCount(this);
-  @override
-  Iterable<TableInfo<Table, Object?>> get allTables =>
-      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
-  @override
-  List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [users, groups, notes, groupCount];
-  @override
-  int get schemaVersion => 9;
-  @override
-  DriftDatabaseOptions get options =>
-      const DriftDatabaseOptions(storeDateTimeAsText: true);
-}

examples/migrations_example/lib/src/versions.dart

@@ -2,351 +2,669 @@ import 'package:drift/internal/versioned_schema.dart' as i0;
 import 'package:drift/drift.dart' as i1;
 import 'package:drift/drift.dart';
 
-final class VersionedSchema extends i0.VersionedSchema {
+final class _S1 extends i0.VersionedSchema {
-  VersionedSchema(super.database);
+  _S1({required super.database}) : super(version: 1);
-  late final List<i1.DatabaseSchemaEntity> entities = [
-    // VERSION 1
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 2
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_1,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 3
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_1,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 4
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 5
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-        column_7,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    null,
-    // VERSION 6
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-        column_8,
-        column_7,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    null,
-    // VERSION 7
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-        column_8,
-        column_7,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    null,
-    i0.VersionedTable(
-      entityName: 'notes',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_9,
-        column_10,
-        column_11,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 8
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-        column_8,
-        column_12,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_4,
-        column_5,
-      ],
-      tableConstraints: [],
-    ),
-    null,
-    i0.VersionedTable(
-      entityName: 'notes',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_9,
-        column_10,
-        column_11,
-      ],
-      tableConstraints: [],
-    ),
-    // VERSION 9
-    i0.VersionedTable(
-      entityName: 'users',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_0,
-        column_6,
-        column_8,
-        column_7,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'groups',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_2,
-        column_3,
-        column_13,
-        column_14,
-      ],
-      tableConstraints: [],
-    ),
-    i0.VersionedTable(
-      entityName: 'notes',
-      withoutRowId: false,
-      isStrict: false,
-      attachedDatabase: database,
-      columns: [
-        column_9,
-        column_10,
-        column_11,
-      ],
-      tableConstraints: [],
-    ),
-    null,
-  ];
   @override
-  Iterable<i1.DatabaseSchemaEntity> allEntitiesAt(int version) {
+  late final List<i1.DatabaseSchemaEntity> entities = [
-    int start, count;
+    users,
-    switch (version) {
+  ];
-      case 1:
+  late final Shape0 users = Shape0(
-        start = 0;
+      source: i0.VersionedTable(
-        count = 1;
+        entityName: 'users',
-      case 2:
+        withoutRowId: false,
-        start = 1;
+        isStrict: false,
-        count = 1;
+        tableConstraints: [],
-      case 3:
+        columns: [
-        start = 2;
+          _column_0,
-        count = 2;
+        ],
-      case 4:
+        attachedDatabase: database,
-        start = 4;
+      ),
-        count = 2;
+      alias: null);
-      case 5:
-        start = 6;
-        count = 3;
-      case 6:
-        start = 9;
-        count = 3;
-      case 7:
-        start = 12;
-        count = 4;
-      case 8:
-        start = 16;
-        count = 4;
-      case 9:
-        start = 20;
-        count = 4;
-      default:
-        throw ArgumentError('Unknown schema version $version');
-    }
-    return entities.skip(start).take(count);
-  }
 }
 
-i1.GeneratedColumn<int> column_0(String aliasedName) =>
+class Shape0 extends i0.VersionedTable {
+  Shape0({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+}
+
+i1.GeneratedColumn<int> _column_0(String aliasedName) =>
     i1.GeneratedColumn<int>('id', aliasedName, false,
         hasAutoIncrement: true,
         type: i1.DriftSqlType.int,
         defaultConstraints:
             i1.GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
-i1.GeneratedColumn<String> column_1(String aliasedName) =>
+
+final class _S2 extends i0.VersionedSchema {
+  _S2({required super.database}) : super(version: 2);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+  ];
+  late final Shape1 users = Shape1(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_1,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+class Shape1 extends i0.VersionedTable {
+  Shape1({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+}
+
+i1.GeneratedColumn<String> _column_1(String aliasedName) =>
     i1.GeneratedColumn<String>('name', aliasedName, false,
         type: i1.DriftSqlType.string);
-i1.GeneratedColumn<int> column_2(String aliasedName) =>
+
+final class _S3 extends i0.VersionedSchema {
+  _S3({required super.database}) : super(version: 3);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+  ];
+  late final Shape1 users = Shape1(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_1,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+class Shape2 extends i0.VersionedTable {
+  Shape2({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get title =>
+      columnsByName['title']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<bool> get deleted =>
+      columnsByName['deleted']! as i1.GeneratedColumn<bool>;
+  i1.GeneratedColumn<int> get owner =>
+      columnsByName['owner']! as i1.GeneratedColumn<int>;
+}
+
+i1.GeneratedColumn<int> _column_2(String aliasedName) =>
     i1.GeneratedColumn<int>('id', aliasedName, false,
         type: i1.DriftSqlType.int, $customConstraints: 'NOT NULL');
-i1.GeneratedColumn<String> column_3(String aliasedName) =>
+i1.GeneratedColumn<String> _column_3(String aliasedName) =>
     i1.GeneratedColumn<String>('title', aliasedName, false,
         type: i1.DriftSqlType.string, $customConstraints: 'NOT NULL');
-i1.GeneratedColumn<bool> column_4(String aliasedName) =>
+i1.GeneratedColumn<bool> _column_4(String aliasedName) =>
     i1.GeneratedColumn<bool>('deleted', aliasedName, true,
         type: i1.DriftSqlType.bool,
         $customConstraints: 'DEFAULT FALSE',
         defaultValue: const CustomExpression<bool>('FALSE'));
-i1.GeneratedColumn<int> column_5(String aliasedName) =>
+i1.GeneratedColumn<int> _column_5(String aliasedName) =>
     i1.GeneratedColumn<int>('owner', aliasedName, false,
         type: i1.DriftSqlType.int,
         $customConstraints: 'NOT NULL REFERENCES users (id)');
-i1.GeneratedColumn<String> column_6(String aliasedName) =>
+
+final class _S4 extends i0.VersionedSchema {
+  _S4({required super.database}) : super(version: 4);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+  ];
+  late final Shape1 users = Shape1(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_6,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+i1.GeneratedColumn<String> _column_6(String aliasedName) =>
     i1.GeneratedColumn<String>('name', aliasedName, false,
         type: i1.DriftSqlType.string, defaultValue: const Constant('name'));
-i1.GeneratedColumn<int> column_7(String aliasedName) =>
+
+final class _S5 extends i0.VersionedSchema {
+  _S5({required super.database}) : super(version: 5);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+    groupCount,
+  ];
+  late final Shape3 users = Shape3(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_6,
+          _column_7,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape4 groupCount = Shape4(
+      source: i0.VersionedView(
+        entityName: 'group_count',
+        createViewStmt:
+            'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users',
+        columns: [
+          _column_8,
+          _column_1,
+          _column_9,
+          _column_10,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+class Shape3 extends i0.VersionedTable {
+  Shape3({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<int> get nextUser =>
+      columnsByName['next_user']! as i1.GeneratedColumn<int>;
+}
+
+i1.GeneratedColumn<int> _column_7(String aliasedName) =>
     i1.GeneratedColumn<int>('next_user', aliasedName, true,
         type: i1.DriftSqlType.int,
         defaultConstraints:
             i1.GeneratedColumn.constraintIsAlways('REFERENCES users (id)'));
-i1.GeneratedColumn<DateTime> column_8(String aliasedName) =>
+
+class Shape4 extends i0.VersionedView {
+  Shape4({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<int> get nextUser =>
+      columnsByName['next_user']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<int> get groupCount =>
+      columnsByName['group_count']! as i1.GeneratedColumn<int>;
+}
+
+i1.GeneratedColumn<int> _column_8(String aliasedName) =>
+    i1.GeneratedColumn<int>('id', aliasedName, false,
+        type: i1.DriftSqlType.int);
+i1.GeneratedColumn<int> _column_9(String aliasedName) =>
+    i1.GeneratedColumn<int>('next_user', aliasedName, true,
+        type: i1.DriftSqlType.int);
+i1.GeneratedColumn<int> _column_10(String aliasedName) =>
+    i1.GeneratedColumn<int>('group_count', aliasedName, false,
+        type: i1.DriftSqlType.int);
+
+final class _S6 extends i0.VersionedSchema {
+  _S6({required super.database}) : super(version: 6);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+    groupCount,
+  ];
+  late final Shape5 users = Shape5(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_6,
+          _column_11,
+          _column_7,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape6 groupCount = Shape6(
+      source: i0.VersionedView(
+        entityName: 'group_count',
+        createViewStmt:
+            'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users',
+        columns: [
+          _column_8,
+          _column_1,
+          _column_11,
+          _column_9,
+          _column_10,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+class Shape5 extends i0.VersionedTable {
+  Shape5({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<DateTime> get birthday =>
+      columnsByName['birthday']! as i1.GeneratedColumn<DateTime>;
+  i1.GeneratedColumn<int> get nextUser =>
+      columnsByName['next_user']! as i1.GeneratedColumn<int>;
+}
+
+i1.GeneratedColumn<DateTime> _column_11(String aliasedName) =>
     i1.GeneratedColumn<DateTime>('birthday', aliasedName, true,
         type: i1.DriftSqlType.dateTime);
-i1.GeneratedColumn<String> column_9(String aliasedName) =>
+
+class Shape6 extends i0.VersionedView {
+  Shape6({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<int> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<DateTime> get birthday =>
+      columnsByName['birthday']! as i1.GeneratedColumn<DateTime>;
+  i1.GeneratedColumn<int> get nextUser =>
+      columnsByName['next_user']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<int> get groupCount =>
+      columnsByName['group_count']! as i1.GeneratedColumn<int>;
+}
+
+final class _S7 extends i0.VersionedSchema {
+  _S7({required super.database}) : super(version: 7);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+    groupCount,
+    notes,
+  ];
+  late final Shape5 users = Shape5(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [],
+        columns: [
+          _column_0,
+          _column_6,
+          _column_11,
+          _column_7,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape6 groupCount = Shape6(
+      source: i0.VersionedView(
+        entityName: 'group_count',
+        createViewStmt:
+            'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users',
+        columns: [
+          _column_8,
+          _column_1,
+          _column_11,
+          _column_9,
+          _column_10,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape7 notes = Shape7(
+      source: i0.VersionedVirtualTable(
+        entityName: 'notes',
+        moduleAndArgs:
+            'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")',
+        columns: [
+          _column_12,
+          _column_13,
+          _column_14,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+class Shape7 extends i0.VersionedVirtualTable {
+  Shape7({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<String> get title =>
+      columnsByName['title']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get content =>
+      columnsByName['content']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get searchTerms =>
+      columnsByName['search_terms']! as i1.GeneratedColumn<String>;
+}
+
+i1.GeneratedColumn<String> _column_12(String aliasedName) =>
     i1.GeneratedColumn<String>('title', aliasedName, false,
         type: i1.DriftSqlType.string, $customConstraints: '');
-i1.GeneratedColumn<String> column_10(String aliasedName) =>
+i1.GeneratedColumn<String> _column_13(String aliasedName) =>
     i1.GeneratedColumn<String>('content', aliasedName, false,
         type: i1.DriftSqlType.string, $customConstraints: '');
-i1.GeneratedColumn<String> column_11(String aliasedName) =>
+i1.GeneratedColumn<String> _column_14(String aliasedName) =>
     i1.GeneratedColumn<String>('search_terms', aliasedName, false,
         type: i1.DriftSqlType.string, $customConstraints: '');
-i1.GeneratedColumn<int> column_12(String aliasedName) =>
+
+final class _S8 extends i0.VersionedSchema {
+  _S8({required super.database}) : super(version: 8);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+    groupCount,
+    notes,
+  ];
+  late final Shape5 users = Shape5(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'UNIQUE(name, birthday)',
+        ],
+        columns: [
+          _column_0,
+          _column_6,
+          _column_11,
+          _column_15,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY (id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_4,
+          _column_5,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape6 groupCount = Shape6(
+      source: i0.VersionedView(
+        entityName: 'group_count',
+        createViewStmt:
+            'CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count FROM users',
+        columns: [
+          _column_8,
+          _column_1,
+          _column_11,
+          _column_9,
+          _column_10,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape7 notes = Shape7(
+      source: i0.VersionedVirtualTable(
+        entityName: 'notes',
+        moduleAndArgs:
+            'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")',
+        columns: [
+          _column_12,
+          _column_13,
+          _column_14,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+i1.GeneratedColumn<int> _column_15(String aliasedName) =>
     i1.GeneratedColumn<int>('next_user', aliasedName, true,
         type: i1.DriftSqlType.int,
         defaultConstraints:
             i1.GeneratedColumn.constraintIsAlways('REFERENCES "users" ("id")'));
-i1.GeneratedColumn<bool> column_13(String aliasedName) =>
+
+final class _S9 extends i0.VersionedSchema {
+  _S9({required super.database}) : super(version: 9);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    users,
+    groups,
+    notes,
+    groupCount,
+  ];
+  late final Shape5 users = Shape5(
+      source: i0.VersionedTable(
+        entityName: 'users',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'UNIQUE(name, birthday)',
+          'CHECK (LENGTH(name) < 10)',
+        ],
+        columns: [
+          _column_0,
+          _column_6,
+          _column_11,
+          _column_7,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape2 groups = Shape2(
+      source: i0.VersionedTable(
+        entityName: 'groups',
+        withoutRowId: false,
+        isStrict: false,
+        tableConstraints: [
+          'PRIMARY KEY(id)',
+        ],
+        columns: [
+          _column_2,
+          _column_3,
+          _column_16,
+          _column_17,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape7 notes = Shape7(
+      source: i0.VersionedVirtualTable(
+        entityName: 'notes',
+        moduleAndArgs:
+            'fts5(title, content, search_terms, tokenize = "unicode61 tokenchars \'.\'")',
+        columns: [
+          _column_12,
+          _column_13,
+          _column_14,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+  late final Shape6 groupCount = Shape6(
+      source: i0.VersionedView(
+        entityName: 'group_count',
+        createViewStmt:
+            'CREATE VIEW group_count AS SELECT\n    users.*,\n    (SELECT COUNT(*) FROM "groups" WHERE owner = users.id) AS group_count\n  FROM users;',
+        columns: [
+          _column_8,
+          _column_1,
+          _column_11,
+          _column_9,
+          _column_10,
+        ],
+        attachedDatabase: database,
+      ),
+      alias: null);
+}
+
+i1.GeneratedColumn<bool> _column_16(String aliasedName) =>
     i1.GeneratedColumn<bool>('deleted', aliasedName, true,
         type: i1.DriftSqlType.bool,
         $customConstraints: 'DEFAULT FALSE',
         defaultValue: const CustomExpression('FALSE'));
-i1.GeneratedColumn<int> column_14(String aliasedName) =>
+i1.GeneratedColumn<int> _column_17(String aliasedName) =>
     i1.GeneratedColumn<int>('owner', aliasedName, false,
         type: i1.DriftSqlType.int,
         $customConstraints: 'NOT NULL REFERENCES users(id)');
+i1.OnUpgrade stepByStep({
+  required Future<void> Function(i1.Migrator m, _S2 schema) from1To2,
+  required Future<void> Function(i1.Migrator m, _S3 schema) from2To3,
+  required Future<void> Function(i1.Migrator m, _S4 schema) from3To4,
+  required Future<void> Function(i1.Migrator m, _S5 schema) from4To5,
+  required Future<void> Function(i1.Migrator m, _S6 schema) from5To6,
+  required Future<void> Function(i1.Migrator m, _S7 schema) from6To7,
+  required Future<void> Function(i1.Migrator m, _S8 schema) from7To8,
+  required Future<void> Function(i1.Migrator m, _S9 schema) from8To9,
+}) {
+  return i1.Migrator.stepByStepHelper(step: (currentVersion, database) async {
+    switch (currentVersion) {
+      case 1:
+        final schema = _S2(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from1To2(migrator, schema);
+        return 2;
+      case 2:
+        final schema = _S3(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from2To3(migrator, schema);
+        return 3;
+      case 3:
+        final schema = _S4(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from3To4(migrator, schema);
+        return 4;
+      case 4:
+        final schema = _S5(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from4To5(migrator, schema);
+        return 5;
+      case 5:
+        final schema = _S6(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from5To6(migrator, schema);
+        return 6;
+      case 6:
+        final schema = _S7(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from6To7(migrator, schema);
+        return 7;
+      case 7:
+        final schema = _S8(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from7To8(migrator, schema);
+        return 8;
+      case 8:
+        final schema = _S9(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from8To9(migrator, schema);
+        return 9;
+      default:
+        throw ArgumentError.value('Unknown migration from $currentVersion');
+    }
+  });
+}

pubspec.lock

@@ -13,10 +13,10 @@ packages:
     dependency: transitive
     description:
       name: args
-      sha256: c372bb384f273f0c2a8aaaa226dad84dc27c8519a691b888725dec59518ad53a
+      sha256: eef6c46b622e0494a36c5a12d10d77fb4e855501a91c1b9ef9339326e58f0596
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.1"
+    version: "2.4.2"
   async:
     dependency: transitive
     description:
@@ -53,10 +53,10 @@ packages:
     dependency: transitive
     description:
       name: cli_util
-      sha256: "66f86e916d285c1a93d3b79587d94bd71984a66aac4ff74e524cfa7877f1395c"
+      sha256: b8db3080e59b2503ca9e7922c3df2072cf13992354d5e944074ffa836fba43b7
       url: "https://pub.dev"
     source: hosted
-    version: "0.3.5"
+    version: "0.4.0"
   collection:
     dependency: transitive
     description:
@@ -85,18 +85,18 @@ packages:
     dependency: transitive
     description:
       name: glob
-      sha256: "4515b5b6ddb505ebdd242a5f2cc5d22d3d6a80013789debfbda7777f47ea308c"
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
   graphs:
     dependency: transitive
     description:
       name: graphs
-      sha256: "772db3d53d23361d4ffcf5a9bb091cf3ee9b22f2be52cd107cd7a2683a89ba0e"
+      sha256: aedc5a15e78fc65a6e23bcd927f24c64dd995062bcd1ca6eda65a3cff92a4d19
       url: "https://pub.dev"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   http:
     dependency: transitive
     description:
@@ -133,18 +133,18 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: "6501fbd55da300384b768785b83e5ce66991266cec21af89ab9ae7f5ce1c4cbb"
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.15"
+    version: "0.12.16"
   melos:
     dependency: "direct dev"
     description:
       name: melos
-      sha256: "993ac467e7a36bd832a6cdabbe18a0487c30bc52b5cca14e476a824679ebdce0"
+      sha256: ccbb6ecd8bb3f08ae8f9ce22920d816bff325a98940c845eda0257cd395503ac
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.1"
+    version: "3.1.0"
   meta:
     dependency: transitive
     description:
@@ -253,10 +253,10 @@ packages:
     dependency: transitive
     description:
       name: stream_channel
-      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
   string_scanner:
     dependency: transitive
     description:
@@ -277,10 +277,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: daadc9baabec998b062c9091525aa95786508b1c48e9c30f1f891b8bf6ff2e64
+      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.2"
+    version: "0.6.0"
   typed_data:
     dependency: transitive
     description: