combine new preferences with stored preferences

lib/server.js

@@ -480,7 +480,6 @@ WalletService.prototype.savePreferences = function(opts, cb) {
   }];
 
   opts = _.pick(opts, _.pluck(preferences, 'name'));
-
   try {
     _.each(preferences, function(preference) {
       var value = opts[preference.name];
@@ -495,17 +494,19 @@ WalletService.prototype.savePreferences = function(opts, cb) {
   }
 
   self._runLocked(cb, function(cb) {
-    var preferences = Model.Preferences.create({
+    self.storage.fetchPreferences(self.walletId, self.copayerId, function(err, oldPref) {
+      if (err) return cb(err);
+
+      var newPref = Model.Preferences.create({
         walletId: self.walletId,
         copayerId: self.copayerId,
-      email: opts.email,
-      language: opts.language,
-      unit: opts.unit,
       });
+      var preferences = Model.Preferences.fromObj(_.defaults(newPref, opts, oldPref));
       self.storage.storePreferences(preferences, function(err) {
         return cb(err);
       });
     });
+  });
 };
 
 /**

test/integration/server.js

@@ -260,7 +260,7 @@ helpers.createAddresses = function(server, wallet, main, change, cb) {
 
 var storage, blockchainExplorer;
 
-var useMongo = true;
+var useMongo = false;
 
 function initStorage(cb) {
   function getDb(cb) {
@@ -1186,7 +1186,7 @@ describe('Wallet service', function() {
         });
       });
     });
-    it.only('should save preferences incrementally', function(done) {
+    it('should save preferences incrementally', function(done) {
       async.series([
 
         function(next) {