public function sort($entityName, $values)
    {
        $values = json_decode($values);

        for ($i=0; $i<count($values); $i++) {
            $this->entityManager
                ->getRepository($entityName)
                ->createQueryBuilder('e')
                ->update()
                ->set('e.order', $i)
                ->where('e.id = :id')
                ->setParameter('id', $values[$i]->id)
                ->getQuery()
                ->execute();
        }
    }