QueryBuilder : how to compose subselect clause - doctrine-query

Question

I'm having trouble converting a plain SQL clause to a Doctrine query.
I've added the clause in plain SQL below:
$query = $doc->getEntityManager ()
->createQueryBuilder ()
->select ( 'r')
->from ( 'AppBundle:CFormResponse', 'r' )
->where ( 'r.formId = :id AND NOT (select f.private from cform f where f.FORM_ID = :id) ' )
->setParameter ( 'id', $formId )->getQuery ();
$result = $query->getResult();
My attempt to convert this clause into DQL is as follows (so far):
$qb = $doc->getEntityManager ()->createQueryBuilder ();
$query = $qb
->select ( 'r')
->from ( 'AppBundle:CFormResponse', 'r' )
->where ( $qb->expr()->andX(
$qb->expr()->eq('r.formId', ':id'),
$qb->expr()->addSelect('(SELECT f.private
FROM AppBundle:CForm f
WHERE f.formId = :id)'
)
) )
->setParameter ( 'id', $formId )->getQuery ();
$result = $query->getResult();
with the addSelect indicating where I'm stuck.
Can anyone point me in the direction of how to do this?

Answer 1

Basically, you need to add not to your addSelect:
$query = $qb
->select ( 'r')
->from ( 'AppBundle:CFormResponse', 'r' )
->where ( $qb->expr()->andX(
$qb->expr()->eq('r.formId', ':id'),
$qb->expr()->not(
$qb->expr()
->select(`f.private`)
->from('AppBundle:CForm', 'f')
->where('f.formId = :id'))
)
) )
->setParameter ( 'id', $formId )->getQuery ();