public function signUpAction()
 {
     $form = new SignUpForm();
     $this->view->form = $form;
     if (isset($_POST)) {
         if ($form->isValid($_POST)) {
             $user = new UserModel();
             $user->populate($_POST);
             $user->save();
         } else {
             foreach ($form->getMessages() as $message) {
                 $this->flash->error($message);
             }
         }
         // $this->view->disable();
     }
 }