public function actionSearch()
 {
     if (!Yii::$app->user->isGuest && Yii::$app->user->identity->role == 'admin') {
         $model = new SearchForm();
         if ($model->load(Yii::$app->request->post())) {
             $query = $model->search();
         } else {
             $query = QueryModel::photos();
         }
         return $this->render('search', ['model' => $model, 'query' => $query]);
     }
     return $this->goBack();
 }