public function actionGetAttributes()
 {
     Yii::$app->response->format = Response::FORMAT_JSON;
     if (!($modelId = Yii::$app->getRequest()->post('model_id'))) {
         return null;
     }
     $params['model_id'] = (int) $modelId;
     $category_id = Yii::$app->getRequest()->post('category_id');
     $params['category_id'] = $category_id ? $category_id : null;
     $entity = EavEntity::findOne($params);
     if (!$entity) {
         try {
             $entity = new EavEntity($params);
             $entity->save();
         } catch (Exception $exc) {
             return false;
         }
     }
     $querySelected = $entity->getEavAttributes()->orderBy('label')->limit(null);
     $queryAvailable = clone $querySelected;
     $selectedDataProvider = new ActiveDataProvider(['query' => $querySelected]);
     $ids = $queryAvailable->select('id')->all();
     $ids = array_map(function ($item) {
         return $item->id;
     }, $ids);
     $ids = !empty($ids) ? implode(', ', $ids) : '0';
     $availableDataProvider = new ActiveDataProvider(['query' => EavAttribute::find()->where("id NOT IN ({$ids})")->limit(null)]);
     $selected = $this->renderIsAjax('attributes', ['dataProvider' => $selectedDataProvider]);
     $available = $this->renderIsAjax('attributes', ['dataProvider' => $availableDataProvider]);
     return ['available' => $available, 'selected' => $selected];
 }