/**
  * @remotable
  */
 public function update($a)
 {
     $password = '';
     if (isset($a->items->password)) {
         $password = $a->items->password;
     }
     if (strlen($password) === 0) {
         unset($a->items->password);
     }
     $response = parent::update($a);
     if (strlen($password) > 0) {
         $response['items'][0]['password'] = $password;
     }
     return $response;
 }