Event::getRelationKey

public function getRelationKey(): string
{
	$result = '';

	switch ($this->type)
	{
		case EventDictionary::EVENT_WORKGROUP_USER_ADD:
		case EventDictionary::EVENT_WORKGROUP_USER_UPDATE:
		case EventDictionary::EVENT_WORKGROUP_USER_DELETE:
			$result = ($this->data['GROUP_ID'] ?? 0) . '_'. ($this->data['USER_ID'] ?? 0);
			break;
	}

	return $result;
}