Fix crash when variables appear more than once

moor/test/data/tables/todos.dart

@@ -71,7 +71,9 @@ class PureDefaults extends Table {
     'allTodosWithCategory': 'SELECT t.*, c.id as catId, c."desc" as catDesc '
         'FROM todos t INNER JOIN categories c ON c.id = t.category',
     'deleteTodoById': 'DELETE FROM todos WHERE id = ?',
-    'withIn': 'SELECT * FROM todos WHERE title = ?2 OR id IN ? OR title = ?1'
+    'withIn': 'SELECT * FROM todos WHERE title = ?2 OR id IN ? OR title = ?1',
+    'search':
+        'SELECT * FROM todos WHERE CASE WHEN -1 = :id THEN 1 ELSE id = :id END',
   },
 )
 class TodoDb extends _$TodoDb {

moor/test/data/tables/todos.g.dart

@@ -1270,6 +1270,38 @@ abstract class _$TodoDb extends GeneratedDatabase {
         }).map((rows) => rows.map(_rowToTodoEntry).toList());
   }
 
+  TodoEntry _rowToTodoEntry(QueryRow row) {
+    return TodoEntry(
+      id: row.readInt('id'),
+      title: row.readString('title'),
+      content: row.readString('content'),
+      targetDate: row.readDateTime('target_date'),
+      category: row.readInt('category'),
+    );
+  }
+
+  Future<List<TodoEntry>> search(
+      int id,
+      {@Deprecated('No longer needed with Moor 1.6 - see the changelog for details')
+          QueryEngine operateOn}) {
+    return (operateOn ?? this).customSelect(
+        'SELECT * FROM todos WHERE CASE WHEN -1 = :id THEN 1 ELSE id = :id END',
+        variables: [
+          Variable.withInt(id),
+        ]).then((rows) => rows.map(_rowToTodoEntry).toList());
+  }
+
+  Stream<List<TodoEntry>> watchSearch(int id) {
+    return customSelectStream(
+        'SELECT * FROM todos WHERE CASE WHEN -1 = :id THEN 1 ELSE id = :id END',
+        variables: [
+          Variable.withInt(id),
+        ],
+        readsFrom: {
+          todosTable
+        }).map((rows) => rows.map(_rowToTodoEntry).toList());
+  }
+
   @override
   List<TableInfo> get allTables => [
         todosTable,

moor_generator/lib/src/writer/query_writer.dart

@@ -195,7 +195,8 @@ class QueryWriter {
     var lastIndex = 0;
 
     for (var sqlVar in vars) {
-      final moorVar = query.variables.singleWhere((f) => f.variable == sqlVar);
+      final moorVar = query.variables
+          .singleWhere((f) => f.variable.resolvedIndex == sqlVar.resolvedIndex);
       if (!moorVar.isArray) continue;
 
       // write everything that comes before this var into the buffer