public function actionIndex()
 {
     $model = new Guest();
     if ($model->load(Yii::$app->request->post())) {
         $model->approved = false;
         $model->done = false;
         $model->save();
     }
     $data = Guest::find()->where(['done' => false])->all();
     return $this->render('index', ['data' => $data]);
 }