How in Yii2 after adding data to clear the form and display a flash message on the same page without resubmitting?

Question

Yii

public function actionAdd()
{
    $model = new News();

    if ($model->load(Yii::$app->request->post())) {
        if ($model->save()) {
            Yii::$app->session->setFlash('success', 'Удача: Новость добавлена!');
            $model = new News();
        } else {
            Yii::$app->session->setFlash('error', 'Ошибка: Не удалось добавить новость!');
        }
    }

    return $this->render('add', compact('model'));
}

And here is such a horror when refreshing the page:

Answer 1

You need to do a redirect after the form entry in order to drop the post. And in session there will be a flash message.