query_builder on sonataAdminBundle is ignored

query_builder on sonataAdminBundle is ignored

I am using sonataAdminBundle and symfony2
I made this script. it filter the search box candidates.
but this query_builder is ignored.
Are there any other points to check ?
public function configureDatagridFilters(DatagridMapper $datagridMapper)
{
$datagridMapper
->add('user',null,
array(
'query_builder' =>
function (\Doctrine\ORM\EntityRepository $rep) {
return $rep->
createQueryBuilder('s')
->where('s.id','1');
})