Remove already asscoiated values from choice list in sonata admin - php

Question

I have an one to one relation in my sonata admin bundle.
Person <-> Player.
If i go to my Person admin i can choose the player from the choice list.
If i go to another Person object the player (which is now already assigned) is shown again ... if i choose it, there occurs an error ...
The error is
Failed to update object: AppBundle\Entity\Person
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '18' for key 'UNIQ_9A5FDF45F6B75B26'
Can i change the behaviour that already assigned values do not appear in other objects?
I cant find a option for doing this in sonata admin

Answer 1

You can generate a custom choice list for every Person.
Add method to PlayerRepository:
class PlayerRepository extends EntityRepository
{
public function getNotAssociatedPlayers($person)
{
$qb = $this->createQueryBuilder('p')
->leftJoin('p.person', 'prsn')
->where('prsn.id is null');
if($person !== null)
{
$qb->orWhere('prsn.id = :person')
->setParameter('person', $person);
}
return $qb->getQuery()
->getResult();
}
}
And use it in PersonAdmin:
protected function configureFormFields(FormMapper $formMapper)
{
$person = ($this->getSubject()->getPlayer() !== null)
? $this->getSubject()->getId()
: null;
$em = $this->getConfigurationPool()->getContainer()->get('doctrine.orm.entity_manager');
$choices = $em->getRepository('YourBundle:Player')->getNotAssociatedPlayers($person);
$formMapper
->add('player', null, array(
'choices' => $choices,
));
Please, let me know if something went wrong with that.
EDIT:
Documented solution is a query_builder option for the field:
$formMapper
->add('player', null, array(
'query_builder' => function(EntityRepository $er)
{
$qb = $er->createQueryBuilder('p')
->leftJoin('p.person', 'prsn')
->where('prsn.id is null');
if($this->getSubject()->getPlayer() !== null)
{
$qb->orWhere('prsn.id = :person')
->setParameter('person', $this->getSubject()->getId());
}
return $qb;
}
));