Yii2 user registration. Why doesn't save() work?

Question

Yii

SiteController

public function actionSignup()
    {
        $model = new User();
        if ($model->load(Yii::$app->request->post())) {
            if ($model->validate()) {
                $model->save();
                Yii::$app->session->setFlash('signUpOk');
                return $this->refresh();
            }
        }

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

model User is inherited from ActiveRecords as expected.

class User extends ActiveRecord implements IdentityInterface

Why, when I submit my signup.php form, I see a flash message with a message, which indicates that I passed the validation. But, is the database empty?

Answer 1

You have the wrong model. You need to create one more SignupForm model (extends yii\base\Model), and in it the fields are already validated and the User'a instance is saved to the database. See how it's done in the advanced template (registration in frontend, user model in common).

Answer 2

Something is preventing the data from being saved, perhaps the beforeSave handler in User.
Flash message, in theory, should be like this:
If the validation has already been done, there is no point in doing it again in save():
Therefore, you need to save it like this:

if ($model->validate()) {
    $model->save(false);
    //..
}

Or like this:

if ($model->save()) {
    //..
}

Answer 3

Okay, I understand the advantage. Now I'll try to add ... something :)
Thank you!