Symfony form query_buider and entity repository - symfony

Question

I'm trying to create a form with data in collection type depending on the user being logged. I'm following this chapter of the Symfony cookbook.
Everything works fine when the query_builder option is a closure where I get my data from DQL. As the data need to be fetched from different location in code, I would prefer to define the query in the Repository class.
Here is the function in my repository :
public function findOwnedBy($user) {
$query = $this->getEntityManager()->createQuery("SELECT l FROM MyBundle:Article a JOIN a.owndBy u WHERE u.id = :userId");
$query->setParameters(array("userId"=>$user->getId()));
return $query->getResult();
}
This function works when called in a Controller and return an array of Article. Here is a snippet of the symfony doc :
$formOptions = array(
'class' => 'Acme\DemoBundle\Entity\User',
'multiple' => false,
'expanded' => false,
'property' => 'fullName',
'query_builder' => function(EntityRepository $er) use ($user) {
// build a custom query, or call a method on your repository (even better!)
},
);
When I put a call to my Repository function in the query_builder, I get an error : Expected argument of type "Doctrine\ORM\QueryBuilder", "array" given, which I can understand because my Repository returns an array of Entity, not a QueryBuilder.
I don't want to duplicate code and create a new QueryBuilder in the Form. What is the best practice to use the query from the Repository ? I was thinking of having two function in the repository, one returning an array and the other returning the QueryBuilder, but the comment in Symfony doc "or call a method on your repository (even better!)" let me think there's better way for this case.

Answer 1

It should be easy. Do the following:
public function queryOwnedBy($user) {
$query = $this->createQueryBuilder('a')
->from('MyBundle:Article', 'a')
->innerJoin('a.owndBy', 'u')
->where('u.id = :id')
->setParameter('id', $user->getId());
return $query;
}
public function findOwnedBy($user) {
return $this->queryOwnedBy($user)
->getQuery()
->getResult();
}
Then in the form builder:
$formOptions = array(
'class' => 'Acme\DemoBundle\Entity\User',
'multiple' => false,
'expanded' => false,
'property' => 'fullName',
'query_builder' => function(EntityRepository $er) use ($user) {
return $er->queryOwnedBy($user);
},
);
EDIT
Thank's for ncatnow and unagi I've changed the previous functions to return the querybuilder

Answer 2

I just did a little fix of saamorim answer. The working code would be something like this:
public function queryOwnedBy($user) {
$query = $this->createQueryBuilder("u")
->where('u.id = :id')
->setParameter('id', $user->getId());
return $query;
}
public function findOwnedBy($user) {
return $this->queryOwnedBy($user)
->getQuery()
->getResult();
}