private function loadModel($id)
 {
     $model = \common\models\entities\Announce::findOne(["id" => $id, "status" => 1]);
     if (!$model) {
         throw new yii\web\NotFoundHttpException('很抱歉查無資料');
     }
     return $model;
 }
 /**
  * Finds the Announce model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $id
  * @return Announce the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id)
 {
     if (($model = Announce::findOne($id)) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.', $this->errorLayout);
     }
 }