HB.SignInRoute = Ember.Route.extend({
  beforeModel: function() {
    if (this.get('currentUser.isSignedIn')) {
      this.transitionTo('dashboard');
    }
  }
});

@@ -149,16 +149,182 @@
 ;%0A    %7D%0A
+  %7D,%0A  setupController: function(controller, model) %7B%0A    controller.set('username', '');%0A    controller.set('password', '');%0A    controller.set('errorMessage', '');%0A
   %7D%0A%7D);%0A

Reset login form on setupController