public function findAllUserRoles($executeQuery = true)
    {
        $dql = '
            SELECT r
            FROM Claroline\CoreBundle\Entity\Role r
            WHERE r.type = :type
        ';

        $query = $this->_em->createQuery($dql);
        $query->setParameter('type', Role::USER_ROLE);

        return $executeQuery ? $query->getResult() : $query;
    }