How to work with activeFom in yii 2?

Question

Yii

Tell me how to do it right. In the form I receive data from the form, they are loaded into the controller. I need to set a default inputText value and add the data received from the form to it.
if ($model->load(Yii::$app->request->post()) && $model->save()) {
$model->images = 'Default!!!!' + data received from the form
How ?
}

Answer 1

If you need to change the value, then validate and save:

if ($model->load(Yii::$app->request->post())) {
    $model->images = 'some value' . $model->images;
    $model->save()) {
        //Save logic
    }
}

If you need to validate and change the value before saving, then:

if ($model->load(Yii::$app->request->post()) && $model->validate()) {
    $model->images = 'some value' . $model->images;
    $model->save(false)) {
        //Save logic
    }
}

Answer 2

$model->images = 'Значение по умолчанию!!!!' . $model->images;