/**
  * Finds the Request model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $id
  * @return Request the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id)
 {
     if (($model = Request::findOne($id)) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
 /**
  * dropping a request//private function
  *
  * @param type $req_id
  */
 private static function dropRequest($req_id)
 {
     $data = Request::findOne($req_id);
     $data->delete();
 }