public function incrementPulls(Manifest $manifest)
    {
        // Increment Manifest
        $this->_em->createQuery(<<<DQL
UPDATE AppBundle:Manifest m
SET m.pulls = m.pulls + 1
WHERE m.id = :manifest
DQL
)->setParameter('manifest', $manifest->getId())->execute();
        // Increment Repository
        $this->_em->createQuery(<<<DQL
UPDATE AppBundle:Repository r
SET r.pulls = r.pulls + 1
WHERE r.id = :repository
DQL
)->setParameter('repository', $manifest->getRepository()->getId())->execute();
    }