/**
  * Advert file deleting.
  */
 public function actionDelete($id)
 {
     $request = Yii::$app->request;
     if ($model = File::findOne($id)) {
         $model->delete();
     }
     if ($request->isAjax) {
     } else {
         return $this->redirect($request->referrer);
     }
 }