/**
  * Aligns the given group selection with the db
  * @return boolean
  */
 public function save()
 {
     $group = $this->getGroup();
     if ($group == null) {
         throw new \yii\web\HttpException(404, Yii::t('AdminModule.models_form_AddGroupMemberForm', 'Group not found!'));
     }
     $userGuids = explode(",", $this->userGuids);
     foreach ($userGuids as $userGuid) {
         $user = User::findIdentityByAccessToken($userGuid);
         if ($user != null) {
             $group->addUser($user);
         }
     }
     return true;
 }