public function actionCreate()
 {
     $model = new Variable();
     if ($model->load(Yii::$app->request->post())) {
         if ($model->checkExist()) {
             LuLu::setFalsh('warning', $model->id . ':已经存在');
             return $this->refresh();
         }
         $model->save();
         CacheUtility::createVariableCache();
         return $this->redirect(['index']);
     } else {
         return $this->render('create', ['model' => $model]);
     }
 }