Changed Model.prototype.save to optionally accept an array of fieldnames to upda…

…te. In that case other fields will not be updated.

lib/sequelize/associations/belongs-to.js

@@ -36,8 +36,8 @@ BelongsTo.prototype.injectSetter = function(obj) {
   
   obj[accessor] = function(associatedObject) {
     obj[self.identifier] = associatedObject ? associatedObject.id : null
-    return obj.save()
+    return obj.save([self.identifier]) // passes the changed field to save, so only that field get updated.
   }
   
   return this
-}
\ No newline at end of file
+}

lib/sequelize/model.js

@@ -51,7 +51,13 @@ Model.prototype.query = function() {
   return s.query.apply(s, args)
 }
 
-Model.prototype.save = function() {
+Model.prototype.save = function(fields) {
+  // if an array with field names is passed to save() only those fields will be updated.
+  var values = fields ? {} : this.values; 
+  if(fields){  
+    Utils._.each(fields, function(field) { this.values[field] && (values[field] = this.values[field]) }, this);
+  }
+   
   var attr = this.options.underscored ? 'updated_at' : 'updatedAt'
   
   if(this.hasOwnProperty(attr))
@@ -70,7 +76,7 @@ Model.prototype.save = function() {
     return eventEmitter.run()
   } else {
     var identifier = this.options.hasPrimaryKeys ? this.definition.primaryKeys : this.id
-    return this.query(QueryGenerator.updateQuery(this.definition.tableName, this.values, identifier))
+    return this.query(QueryGenerator.updateQuery(this.definition.tableName, values, identifier))
   }
 }
 
@@ -169,4 +175,4 @@ Model.prototype.equalsOneOf = function(others) {
 }
 
 /* Add the instance methods to Model */
-Utils._.map(Mixin.instanceMethods, function(fct, name) { Model.prototype[name] = fct})
\ No newline at end of file
+Utils._.map(Mixin.instanceMethods, function(fct, name) { Model.prototype[name] = fct})