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