/**
  * Updates an existing Post 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 ($model->load(Yii::$app->request->post()) && $model->save()) {
         $model->unlinkAll('categories', true);
         foreach (Category::getCategoriesById($model->categories_id) as $category) {
             $model->link('categories', $category);
         }
         return $this->redirect(['view', 'id' => $model->id]);
     } else {
         $model->categories_id = ArrayHelper::getColumn($model->categories, 'id');
         return $this->render('update', ['model' => $model]);
     }
 }
 /**
  * Updates an existing Post model.
  * If update is successful, the browser will be redirected to the 'view' page.
  * @param integer $id
  * @return mixed
  */
 public function actionUpdate($id)
 {
     /** @var Post $model */
     $model = $this->findModel($id);
     if ($model->load(Yii::$app->request->post()) && $model->save()) {
         $model->unlinkAll('categories', true);
         foreach (Category::getCategoriesById($model->categories_id) as $category) {
             $model->link('categories', $category);
         }
         return $this->redirect(['view', 'id' => $model->id]);
     } else {
         /** @var Category $category */
         foreach ($model->categories as $category) {
             if ($category->active) {
                 $model->categories_id[] = $category->id;
             }
         }
         return $this->render('update', ['model' => $model]);
     }
 }