public function init()
{
/* @var $formatter Formatter */
$formatter = Yii::$app->formatter;
if ($this->mask === null) {
$this->mask = Yii::$app->formatter->pasportNomerFormat;
}
parent::init();
$formatter->nullDisplay = '';
$this->model->{$this->attribute} = $formatter->asPasportNomer($this->model->{$this->attribute});
}