DoD::saveListAction

public function saveListAction(int $taskId, int $typeId, array $items = []): ?string
{
	$userId = User::getId();

	$itemService = new ItemService();
	$typeService = new TypeService();
	$entityService = new EntityService();
	$definitionOfDoneService = new DefinitionOfDoneService($userId);

	$type = $typeService->getType($typeId);
	if ($type->isEmpty())
	{
		$this->errorCollection->setError(
			new Error(
				Loc::getMessage('TASKS_SDC_ERROR_TYPE_NOT_FOUND'),
				self::ERROR_COULD_NOT_SAVE_SETTINGS
			)
		);

		return null;
	}

	$entity = $entityService->getEntityById($type->getEntityId());
	if (!Group::canReadGroupTasks($userId, $entity->getGroupId()))
	{
		$this->errorCollection->setError(
			new Error(
				Loc::getMessage('TASKS_SDC_ERROR_ACCESS_DENIED'),
				self::ERROR_ACCESS_DENIED
			)
		);

		return null;
	}

	$scrumItem = $itemService->getItemBySourceId($taskId);
	if ($scrumItem->isEmpty())
	{
		$this->errorCollection->setError(
			new Error(
				Loc::getMessage('TASKS_SCRUM_DEFINITION_OF_DONE_SAVE_ITEM_ERROR'),
				self::ERROR_COULD_NOT_SAVE_ITEM_LIST
			)
		);

		return null;
	}

	$scrumItem->setTypeId($type->getId());

	$itemService->changeItem($scrumItem);

	$result = $definitionOfDoneService->mergeList(
		ItemChecklistFacade::class,
		$scrumItem->getId(),
		$items
	);

	if ($result->isSuccess())
	{
		return '';
	}
	else
	{
		$this->errorCollection->setError(
			new Error(
				Loc::getMessage('TASKS_SCRUM_DEFINITION_OF_DONE_SAVE_ITEM_ERROR'),
				self::ERROR_COULD_NOT_SAVE_ITEM_LIST
			)
		);

		return null;
	}
}