/**
* @param string $role
*
* @return array
*/
public function findWithoutRole($role)
{
$qb = $this->_em->createQueryBuilder();
$qb->select('u')
->from($this->_entityName, 'u')
->where('u.roles NOT LIKE :roles')
->setParameter('roles', '%"' . $role . '"%');
return $qb->getQuery()->getResult();
}