/**
  * Creates a new Post model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @return mixed
  */
 public function actionCreate()
 {
     $model = new Post();
     if ($model->load(Yii::$app->request->post()) && $model->save()) {
         foreach (Category::getCategoriesById($model->categories_id) as $category) {
             $model->link('categories', $category);
         }
         return $this->redirect(['view', 'id' => $model->id]);
     } else {
         return $this->render('create', ['model' => $model]);
     }
 }
 /**
  * Creates a new Post model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @return mixed
  */
 public function actionCreate()
 {
     $model = new Post();
     $model->user_id = Yii::$app->user->id;
     if ($model->load(Yii::$app->request->post())) {
         $postData = Yii::$app->request->post('Post');
         if (!empty($postData['categories'])) {
             foreach ($postData['categories'] as $categoryId) {
                 $category = Category::find()->where(['id' => $categoryId])->one();
                 $model->link('categories', $category);
             }
         }
         $model->setScenario('create');
         $model->poster = \yii\web\UploadedFile::getInstance($model, 'poster');
         if ($model->save() && $model->upload()) {
             return $this->redirect(['view', 'id' => $model->id]);
         }
     }
     return $this->render('create', ['model' => $model]);
 }