yupe\models\Settings::beforeSave PHP Method

    public function beforeSave()
    {
        $this->update_time = new CDbExpression('NOW()');
        if ($this->getIsNewRecord()) {
            $this->create_time = $this->update_time;
        }
        $this->user_id = Yii::app()->hasComponent('user') ? Yii::app()->getUser()->getId() : null;
        return parent::beforeSave();
    }