update settings object merging

scripts/models/settingsmodel.js

@@ -70,6 +70,8 @@ define(
 
 			function save ( newSettings ) {
 				if ( useLocalForage ) {
+					newSettings = getValidSettings( newSettings );
+					
 					if ( worker ) {
 						sendMessageToWorker( 'save', newSettings );
 					} else {
@@ -142,24 +144,29 @@ define(
 				if ( newSettings ) {
 					settings = newSettings || defaultSettings;
 
-					if ( settings !== defaultSettings ) {
-						for ( var name in defaultSettings ) {
-							if ( ! settings[name] ) {
-								settings[name] = defaultSettings[name];
-							}
+					if ( objectHelper.isEqual( getValidSettings( settings ), settings ) ) {
+						for ( var name in settings ) {
+							publishers.update.dispatch( name, settings[name].value, settings[name].options );
 						}
+					} else {
+						save( getValidSettings( settings ) );
 					}
-
-					for ( var name in settings ) {
-						publishers.update.dispatch( name, settings[name].value, settings[name].options );
-					}
-
 				} else {
 					settings = defaultSettings;
 					save( settings );
 				}
 			}
 
+			function getValidSettings ( settings ) {
+				if ( settings&& defaultSettings && settings !== defaultSettings ) {
+					settings = objectHelper.merge( settings, defaultSettings );
+				}
+
+				return settings;
+			}
+
+
+
 			self.getSetting = getSetting;
 			self.getSettingValue = getSettingValue;
 			self.getSettings = getSettings;

scripts/util/object.js

@@ -27,9 +27,39 @@ define(
 			return JSON.parse( JSON.stringify( obj ) );
 		}
 
+		function isEqual ( obj1, obj2 ) {
+			return JSON.stringify( obj1 ) === JSON.stringify( obj2 );
+		}
+
+		// http://stackoverflow.com/a/383245/229189
+		// add missing properties from obj2
+		function merge ( obj1, obj2 ) {
+			obj1 = getCopy( obj1 );
+			obj2 = getCopy( obj2 );
+
+			for ( var p in obj2 ) {
+				try {
+					// Property in destination object set; update its value.
+					if ( typeof obj2[p] === 'object' ) {
+						obj1[p] = merge( obj1[p], obj2[p] );
+					} else {
+						if ( typeof obj1[p] === 'undefined' && typeof obj2[p] !== 'undefined' ) {
+							obj1[p] = obj2[p];
+						}
+					}
+				} catch ( e ) {
+					obj1[p] = obj2[p];
+				}
+			}
+
+			return obj1;
+		}
+
 		return {
 			getObjectByString: getObjectByString,
-			getCopy: getCopy
+			getCopy: getCopy,
+			merge: merge,
+			isEqual: isEqual
 		};
 	}
 );