public function getNextLaneForSection(RaceSection $raceSection)
 {
     $em = $this->getEntityManager();
     $qb = $em->createQueryBuilder();
     $qb->select('MAX(r.lane) maxNum')->from('AppBundle:Registration', 'r')->where($qb->expr()->eq('r.section', '?1'))->setParameter(1, $raceSection->getId());
     return (int) $qb->getQuery()->getSingleScalarResult() + 1;
 }