Doctrine does not automatically load joined relation using GROUP BY - mysql

Question

I have two Doctrine entity classes: Vertriebsschiene and Filiale:
/**
* Vertriebsschiene
*
* #ORM\Table(name="vertriebsschiene", indexes={
* #ORM\Index(columns={"name"}, flags={"fulltext"})
* }))
* #ORM\Entity(repositoryClass="CRMBundle\Repository\VertriebsschieneRepository")
*/
class Vertriebsschiene
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=100)
*/
private $name;
/**
* #var ArrayCollection
*
* #ORM\OneToMany(targetEntity="Filiale", mappedBy="vertriebsschiene", fetch="EAGER")
*/
private $filialen;
...
}
/**
* Filiale
*
* #ORM\Table(name="filiale")
* #ORM\Entity(repositoryClass="CRMBundle\Repository\FilialeRepository")
*/
class Filiale extends Lieferant
{
/**
* #var Vertriebsschiene
*
* #ORM\ManyToOne(targetEntity="CRMBundle\Entity\Vertriebsschiene", inversedBy="filialen", fetch="EAGER")
*/
private $vertriebsschiene;
...
}
The Vertriebsschine objects have a non-uniqe name. Now I try to display a list of Vertriebsschiene objects with their Filiale objects.
My findAllQuery method looks like this:
/**
* #param User $user
* #return \Doctrine\ORM\Query
*/
public function findAllQuery(User $user){
$qb = $this->createQueryBuilder('v')
->select('v as vertriebsschiene')
->addSelect('COUNT(f) as filial_num')
->leftJoin('v.filialen', 'f')
->groupBy('v.name');
$this->restrictAccess($user, $qb);
return $qb->getQuery();
}
/**
* #param User $user
* #param $qb
*/
protected function restrictAccess(User $user, QueryBuilder &$qb)
{
if ($user->hasRole(RoleVoter::AUSSENDIENST)) {
$qb ->leftJoin('f.vertreter', 'u')
->leftJoin('u.vertretungen', 'vx')
->andWhere($qb->expr()->orX(
'f.vertreter = :userid',
'f.vertreter IS NULL',
$qb->expr()->andX(
'vx.proxy = :userid',
$qb->expr()->between(':currentDate', 'vx.start', 'vx.end')
)
))
->setParameter('userid', $user->getId())
->setParameter('currentDate', new \DateTime(), \Doctrine\DBAL\Types\Type::DATETIME);
}
}
My problem is, that the Vertriebsschiene::$filiale array collection is not automatically loaded, but is loaded for every Vertriebsschiene resulting in many DB connections.
This also has the problem, that the WHERE statement is ignored when the Vertriebsschiene::$filiale is fetched.
The COUNT(f) returns the correct amount of Filiale objects.
I suspect this is an issue with the GROUP BY statement.

Answer 1

I think the problem is that you do not tell doctrine to select filiale fields.
Try to add the filiale alias in your select :
public function findAllQuery(User $user){
$qb = $this->createQueryBuilder('v')
->select('v as vertriebsschiene', 'f')
->addSelect('COUNT(f) as filial_num')
->leftJoin('v.filialen', 'f')
->groupBy('v.name');
$this->restrictAccess($user, $qb);
return $qb->getQuery();
}
If you check your query in the profiler, i think you'll see that doctrine add a LEFT JOIN fialiale f0_ ON v0_.id = f0_.vertriebsschiene_id (or something like this but does not add SELECT ... f0_.id, f0_.xxxx.
So every time you'll call $vertriebsschiene->getFieliale()->getXXX() doctrine will have to execute the corresponding query to get the filiale data.