SonataAdminBundle : datagrid filter to filter by role

gistfile1.php

->add('with_role', 'doctrine_orm_callback', array('label' => 'role',
                    'callback' => function($queryBuilder, $alias, $field, $value) {
                        if (!$value['value']) {
                            return;
                        }

                        $queryBuilder->andWhere($alias.'.roles LIKE :role');
                        $queryBuilder->setParameter('role', '%'.$value['value'].'%');

                        return true;
                    },
                    'field_type' => 'choice',
                    'field_options' => array('choices' => array("ROLE_SUPER_ADMIN" => "ROLE_SUPER_ADMIN", "ROLE_EDITION_ADMIN" => "ROLE_EDITION_ADMIN", "ROLE_USER" => "ROLE_USER"))

                ))