private function findContactsByIds($ids)
{
if (count($ids) === 0) {
return [];
}
$queryBuilder = $this->entityManager->createQueryBuilder()->select('CONCAT(\'c\', c.id) AS id, CONCAT(CONCAT(c.firstName, \' \'), c.lastName) AS name')->from($this->contactEntityClass, 'c')->where('c.id IN (:ids)');
$query = $queryBuilder->getQuery();
$query->setParameter('ids', $ids);
return $query->getArrayResult();
}