Join DQL when intermediate table has not entity mapped - php

Question

I'm building a repository method to look if a fos_group is assigned to any fos_user before allowing group to be deleted. Basically this is the raw query I'm trying to make using DQL:
SELECT
COUNT(*)
FROM
fos_user u
LEFT JOIN fos_user_user_group fug ON (fug.user_id = u.id)
WHERE
fug.group_id = :group_id
This is how I setup the relationship between Users and Groups:
/**
* #ORM\ManyToMany(targetEntity="Group")
* #ORM\JoinTable(name="fos_user_user_group",
* joinColumns={#ORM\JoinColumn(name="user_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="group_id", referencedColumnName="id")}
* )
*/
protected $groups;
And this is what I have done til now:
$qb = $this->getEntityManager()->createQueryBuilder();
$qb
->select('COUNT(gr.id)')
->from("UserBundle:Group", "gr");
return $qb->getQuery()->getSingleScalarResult();
But I'm stuck since I do not know how to add the join sentence with not mapped table/entity (fos_user_user_group), can anyone give me some push?

Answer 1

You have mapped your property there you are in right way just join the property $groups in user entity it will join your junction table fos_user_user_group and the use what ever you where clause is
$qb
->select('COUNT(g.id)')
->from('UserBundle:User', 'u')
->join('u.groups g')
->where('g.id = :val')
->setParameter('val',$your_group_id);