public function actionList()
 {
     $params = Yii::$app->request->queryParams;
     $limit = $params["iDisplayLength"];
     $offset = $params["iDisplayStart"];
     $sEcho = $params["sEcho"];
     $query = Community::find();
     $count = $query->count();
     $aaData = $query->asArray()->orderBy(['community_id' => SORT_DESC])->limit($limit)->offset($offset)->all();
     \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
     return ['success' => true, 'aaData' => $aaData, "iTotalRecords" => $count, "iTotalDisplayRecords" => $count, "sEcho" => $sEcho];
 }