/**
  * @param $id
  * @throws HttpException
  */
 protected function findModel($id)
 {
     if (is_array($id)) {
         $model = StoreProduct::findIdentities($id);
     } else {
         $model = StoreProduct::findIdentity($id);
     }
     if ($model !== null) {
         return $model;
     } else {
         throw new HttpException(404);
     }
 }