symfony2 doctrine findBy id in arrayCollection

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Using Symfony2.3.4 and Doctrine.

I have a class Student with a ManyToMany relation with a class Edition.

Now in my StudentController I have this IndexAction($edition_id) to list not all students in the DB but only those related to the given Edition id.

$entities = $em->getRepository('PersonBundle:Student')->findBy(array(
    ????????
));

I'm thinking of some kind of criteria to use with $edition_id but can't come up with any.

Tips appreciated, thanks.

asked 48 secs ago

jmiguel

19