public function actionUpdate($id)
    {
        $model = $this->findModel($id);

        // if the model has an anonymousUsername value
        // we will consider it as an anonymous message
        if (!is_null($model->anonymousUsername))
        {
            $model->scenario = $model::SCENARIO_ANONYMOUS;
        }


        if ($model->load(Yii::$app->request->post()) && $model->save())
        {
            Yii::$app->session->setFlash('success', Yii::t('app', 'Comment has been saved.'));

            return $this->redirect(['index']);
        }

        return $this->render($this->updateView, [
            'model' => $model,
        ]);

    }