public function actionDelete($id = null)
 {
     if (null === $id || null === ($model = View::findOne($id))) {
         throw new NotFoundHttpException();
     }
     if (!$model->delete()) {
         Yii::$app->session->setFlash('error', Yii::t('app', 'Object not removed'));
     } else {
         Yii::$app->session->setFlash('info', Yii::t('app', 'Object removed'));
     }
     return $this->redirect(Url::toRoute('index'));
 }
 public function down()
 {
     $default_view = \app\models\View::findOne(['id' => 1]);
     $default_view->view = 'show';
     $default_view->save();
 }