/**
* Perform the action
* @param Model $model
* @param type $event
* @return HistoryLog|null Returns null when nothing changes
*/
public function performAction(Model $model, $event)
{
$modelPrevState = $model->getPrevState();
$changedValues = $model->getModifiedAttributes();
if (count($changedValues)) {
$history = new HistoryLog();
$history->version = $modelPrevState ? $modelPrevState->version + 1 : 0;
$history->model_type = get_class($model);
$history->model_id = $model->id;
$history->user_id = $model->getUserId();
$history->changed_value = json_encode($changedValues);
$history->save();
return $history;
}
return null;
}
