CheckList::processUpdate

private function processUpdate()
{
	/** @noinspection PhpVariableNamingConventionInspection */
	global $USER_FIELD_MANAGER;

	$updateResult = new Result();

	$id = $this->fields->getId();
	$facade = $this->facade;

	/** @noinspection PhpUndefinedVariableInspection */
	$oldItemFields = (($facade::$oldItemsToMerge[$id] ?? null) ?: $facade::getList([], ['ID' => $id])[$id]);
	$oldItem = new CheckList(0, $this->userId, $facade, $oldItemFields);

	$changedFields = $this->getChangedFields($oldItem->getFields());
	$tableFields = $changedFields['TABLE'];
	$commonFields = $changedFields['COMMON'];

	if (array_key_exists('SORT_INDEX', $tableFields) || array_key_exists('PARENT_ID', $commonFields))
	{
		$this->recountSortIndexes(Application::getConnection());
	}

	if (!empty($tableFields))
	{
		$checkListDataController = $this->checkListDataController;
		$updateTableResult = $checkListDataController::update($id, $tableFields);
		if (!$updateTableResult->isSuccess())
		{
			$facade::logError($updateTableResult->getErrorMessages()[0]);
		}
	}

	if (array_key_exists('MEMBERS', $commonFields))
	{
		try
		{
			$this->updateMembers($oldItem->fields->getMembers(), $this->fields->getMembers());
		}
		catch (Exception $exception)
		{
			$facade::logError($exception->getMessage());
		}
	}

	if (array_key_exists('ATTACHMENTS', $commonFields) && ModuleManager::isModuleInstalled('disk'))
	{
		$userFields = ['UF_CHECKLIST_FILES' => $commonFields['ATTACHMENTS']];
		$USER_FIELD_MANAGER->Update($this->userFieldsEntityIdName, $id, $userFields, $this->userId);

		$this->setFields(['ATTACHMENTS' => $facade::getList(['ATTACHMENTS'], ['ID' => $id])[$id]['ATTACHMENTS']]);
	}

	$newParentId = ($commonFields['PARENT_ID'] ?? null);

	if (isset($newParentId))
	{
		$checkListTree = $this->checkListTree;

		if ($newParentId === 0)
		{
			$detachResult = $checkListTree::detachSubTree($id);
			if (!$detachResult->isSuccess())
			{
				$updateResult->loadErrors($detachResult->getErrors());
				return $updateResult;
			}
		}
		else
		{
			$attachResult = $checkListTree::attach($id, $newParentId);
			if (!$attachResult->isSuccess())
			{
				$updateResult->loadErrors($attachResult->getErrors());
				return $updateResult;
			}
		}
	}

	$facade::doUpdatePostActions($this->fields->getEntityId(), $this->userId, $oldItem, $this);

	return $updateResult;
}