```php $em = $this->managerRegistry->getManager(); $travelDestinationRepository = $em->getRepository(TravelDestination::class); $childDestinationIdsQueryBuilder = $travelDestinationRepository->getChildrenQueryBuilder($parentDestinationIds); ``` > ------ ------------------------------------------------------------------------- > Line src/AppBundle/ApiPlatform/Doctrine/Orm/Filter/EventLocationFilter.php > ------ ------------------------------------------------------------------------- > 99 Call to an undefined method > Doctrine\Common\Persistence\ObjectRepository::getChildrenQueryBuilder() > . > ------ -------------------------------------------------------------------------