framework/behaviors/BlameableBehavior.php
public function init()
    {
        parent::init();

        if (empty($this->attributes)) {
            $this->attributes = [
                BaseActiveRecord::EVENT_BEFORE_INSERT => [$this->createdByAttribute, $this->updatedByAttribute],
                BaseActiveRecord::EVENT_BEFORE_UPDATE => $this->updatedByAttribute,
            ];
        }
    }
public function init()
    {
        parent::init();

        if (empty($this->attributes)) {
            $this->attributes = [
                BaseActiveRecord::EVENT_BEFORE_INSERT => [$this->createdByAttribute, $this->updatedByAttribute],
                BaseActiveRecord::EVENT_BEFORE_UPDATE => $this->updatedByAttribute,
            ];
        }
    }
{@inheritdoc}