/**
  * Updates an existing Blog model.
  * If update is successful, the browser will be redirected to the 'view' page.
  * @param integer $id
  * @return mixed
  */
 public function actionUpdate($id)
 {
     $model = $this->findModel($id);
     if (Blog::saveImageAndModel($model, Yii::$app->request->post())) {
         return $this->redirect(['view', 'id' => $model->id]);
     }
     return $this->render('update', ['model' => $model]);
 }