Networking\InitCmsBundle\Controller\MediaAdminController::doBatchDelete PHP Method

    protected function doBatchDelete(ProxyQueryInterface $queryProxy)
    {
        $modelManager = $this->admin->getModelManager();
        $class = $this->admin->getClass();
        $queryProxy->select('DISTINCT ' . $queryProxy->getRootAlias());
        try {
            $entityManager = $modelManager->getEntityManager($class);
            $i = 0;
            foreach ($queryProxy->getQuery()->iterate() as $pos => $object) {
                $entityManager->remove($object[0]);
                if (++$i % 20 == 0) {
                    $entityManager->flush();
                    $entityManager->clear();
                }
            }
            $entityManager->flush();
            $entityManager->clear();
        } catch (\PDOException $e) {
            throw new ModelManagerException('', 0, $e);
        } catch (DBALException $e) {
            throw new ModelManagerException('', 0, $e);
        }
    }