Symfony2 Form query_builder - allow null

Question

In Symfony2 forms, when trying to get entities, Symfony expects to receive QueryBuilder object, but sometimes there are no entities returned. In that case, an error message appears:

Expected argument of type "Doctrine\\ORM\\QueryBuilder", "NULL" given

How to make query_builder to allow option that there are no entities available.

$builder
    ->add('client', 'entity', array(
        'class'         => 'Faktura\FakturaBundle\Entity\Client',
        'query_builder' => function(\Web\MyBundle\Repository\ClientRepository $er) use ($company){
            return $er->getClients($company);
    ))
;

ClientRepository.php

public function getClients($company)
{
    $qb = $this->createQueryBuilder('c')
        ->select('c')
        ->where('c.company = :company')
        ->setParameter('company', $company)
        ->getQuery();

    return $qb->getResult();
}

Actually, it's just basic $er->findBy(array('company' => $company)) method but I use custom getClients() method

Answer 1

Your Closure should return QueryBuilder object, not results of it.

Your ClientRepository should look like:

public function getClients($company)
{
    $qb = $this->getClientsQueryBuilder($company);
    return  $qb->getQuery()->getResult();
}

public function getClientsQueryBuilder($company)
{
    return $this->createQueryBuilder('c')
        ->select('c')
        ->where('c.company = :company')
        ->setParameter('company', $company);

}

And then you need to use getClientQueryBuilder in your Closure.

$builder
    ->add('client', 'entity', array(
        'class'         => 'Faktura\FakturaBundle\Entity\Client',
        'query_builder' => function(\Web\MyBundle\Repository\ClientRepository $er) use ($company){
            return $er->getClientsQueryBuilder($company);
    ))
;