Symfony Doctrine, select from subquery with join

Question

Haven't been able to find a solid solution for this, but I have a mySQL query that I want to translate to Doctrine. It is a select from a subquery with joins and I might have read somewhere that joins are not allowed in subqueries in Doctrine.

Here is the SQL:

SELECT part, SUM(qty) as qty FROM (SELECT part, SUM(qty) as qty FROM sub LEFT JOIN main ON main.id = main_id WHERE hold != 1 GROUP BY name, part) AS tbl GROUP BY part

This is what I tried and it is all wrong.

 $em = $this->getDoctrine()->getManager();

    $q = $em->createQuery('v');
    $q2 = $em->createSubQuery()
        ->select('m.part, sum(s.qty) qty')
        ->from('Sub s')
        ->leftJoin('s.main m')
        ->where('s.hold != 1')
        ->groupBy('m.part');

    $q->select('m.part, sum(qty)', $q2->getDQL());

One of the first error I got was:

FatalErrorException: Error: Call to undefined method Doctrine\ORM\EntityManager::createSubQuery() in ....Controller.php line 238

I am pretty sure it isn't just this that I'm doing wrong but it is the first thing that's coming up. So getManager() apparently doesn't have a createSubQuery() function? What is the right way to do this?

Solution

There's no method like createSubQuery(). Take a look at that answer: https://stackoverflow.com/a/10763358