/**
  * Finds the UserToBranch model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param  integer               $id_branch
  * @param  integer               $id_user
  * @return UserToBranch          the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id_branch, $id_user)
 {
     if (($model = UserToBranch::findOne(['id_branch' => $id_branch, 'id_user' => $id_user])) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }