yii2 after save

gistfile1.txt

 public function afterSave($insert, $changedAttributes)
    {
        if (($this->scenario == 'user' || $this->scenario == 'guest') && $this->isNewRecord)
            \Yii::$app->mailer->compose('new_comment', ['model' => $this])
                ->setFrom([\Yii::$app->params['supportEmail'] => \Yii::$app->name . ' robot'])
                ->setTo(Email::getByGroup(Email::COMMENTS))
                ->setSubject('Some subject')
                ->send();
        parent::afterSave($insert, $changedAttributes);
    }