Allow 'isValid' to check specific attributes even when no View is associated with the model. thedersen#302

Author: Luiz Américo

src/backbone-validation.js

@@ -244,14 +244,17 @@ Backbone.Validation = (function(_){
           }
           if (attrs) {
             flattened = flatten(this.attributes);
-            //Loop through all associated views
-            _.each(this.associatedViews, _.bind(function(view) {
-              _.each(attrs, _.bind(function (attr) {
-                error = validateAttr(this, attr, flattened[attr], _.extend({}, this.attributes));
-                if (error) {
-                  options.invalid(view, attr, error, options.selector, this);
+            //Loop through all attributes and mark attributes invalid if appropriate
+            _.each(attrs, _.bind(function (attr) {
+              error = validateAttr(this, attr, flattened[attr], _.extend({}, this.attributes));
+              if (error) {
                   invalidAttrs = invalidAttrs || {};
                   invalidAttrs[attr] = error;
+              }
+              //trigger valid/invalid events for each associated view
+              _.each(this.associatedViews, _.bind(function(view) {
+                if (error) {
+                  options.invalid(view, attr, error, options.selector, this);
                 } else {
                   options.valid(view, attr, options.selector, this);
                 }