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Answer : I've found the solution by myself, to add a custom field after the serialization has been done we've to create a listener class like this: <?php namespace Acme\DemoBundle\Listener; use JMS\DiExtraBundle\Annotation\Service; use JMS\DiExtraBundle\Annotation\Tag; use JMS\DiExtraBundle\Annotation\Inject; use JMS\DiExtraBundle\Annotation\InjectParams; use Symfony\Component\HttpKernel\Event\PostResponseEvent; use Acme\DemoBundle\Entity\Team; use JMS\Serializer\Handler\SubscribingHandlerInterface; use JMS\Serializer\EventDispatcher\EventSubscriberInterface; use JMS\Serializer\EventDispatcher\PreSerializeEvent; use JMS\Serializer\EventDispatcher\ObjectEvent; use JMS\Serializer\GraphNavigator; use JMS\Serializer\JsonSerializationVisitor; /** * Add data after serialization * * @Service("acme.listener.serializationlistener") * @Tag("jms_serializer.event_subscriber") */ class SerializationListener implements EventSubscriberInterface { /**...

Answer : Something like: $qb = $entityManager->createQueryBuilder(); $qb->select('count(account.id)'); $qb->from('ZaysoCoreBundle:Account','account'); $count = $qb->getQuery()->getSingleScalarResult(); Some folks feel that expressions are somehow better than just using straight DQL. One even went so far as to edit a four year old answer. I rolled his edit back. Go figure. Here is another way to format the query: return $repository->createQueryBuilder('u') ->select('count(u.id)') ->getQuery() ->getSingleScalarResult(); It's better to move all logic of working with database to repositores. So in controller you write /* you can also inject "FooRepository $repository" using autowire */ $repository = $this->getDoctrine()->getRepository(Foo::class); $count = $repository->count(); And in Repository/FooRepository.php public function count() { $qb = $repository-...