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