Question

I am confronted to a problem that is driving me crazy for more than 3 days and I do not find any solutions. Nevertheless I found a post on stackoverflow that is EXCACTLY the problem I am facing. Unfortunately the person did manage to find a solution on his down but he or she did not shared it fully. As he explained it perfectly let just copy paste it here below:
By the way it seems that person who created that post only created his account for this problem and never came back since for other things. That it is why I allow myself to ask here again…

I have 2 entities (A and B) with a Many to One relationship between
them.

I create my form with the A entity and i use an entity field (dropdown
list) to display the rows in the B entity. I use a query builder to
filter them. If don’t change the values in the list (ie. with ajax),
everything is working fine.

But if I change dynamicly the values in the dropdown, when I submit
the form I have this error “This value is invalid”

It’s because the submitted value isn’t included in the “array”
returned by the query builder.

It seems that this validation is automatic in symfony for entity field
(I don’t use any asserts on this field). I’d like to get rid of this.
But how ?

It seems that I need to implement Form Events. Unfortunatally I do not get it. I read the documentation which is very poor on that subject, read a lot of posts, searched on the Internet but did not found anything.

Here below my personal form type. What I do is the following. I create the first entity field type with the mapped property set to false and filter the entity just to get the departements. Then I create another entity type called localisation. By default I filter the entity to get nothing (”). What I do then to populate it is to use Jquery. But unfortunatelly I am confro,ted to the same problem as the other buddy (see above).

use Symfony\Component\Form\FormBuilderInterface;
use FOS\UserBundle\Form\Type\RegistrationFormType as BaseType;
use Doctrine\ORM\EntityRepository;
use Auth\GeoBundle\Form\LocalisationType;


class RegistrationFormType extends BaseType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        $builder->add('departement', 'entity', array(
            'mapped' => false,
            'empty_value' => '',
            'class' => 'AuthGeoBundle:Localisation',
            'property' => 'departement',
            'query_builder' => function ($repository) {
                return $repository
                    ->createQueryBuilder('e')
                    ->add('groupBy', 'e.departement')
                ;
            },
        ));


        $builder->add('localisation', 'entity', array(
            'empty_value' => '',
            'class' => 'AuthGeoBundle:Localisation',
            'property' => 'formLabel',
            'query_builder' => function ($repository) use ($dpt) {
                return $repository
                    ->createQueryBuilder('e')
                    ->where('e.departement = :dpt')
                    ->setParameter('dpt', '')
                    ->add('orderBy', 'e.ville ASC')
                ;
            },
        ));

        //some other fields here...
    }

    public function getName()
    {
        return 'auth_user_registration';
    }
}

Answer 1

I finally manage to find a solution using the form events. I played with the “tutorial” at http://symfony.com/doc/current/cookbook/form/dynamic_form_generation.html and got it working 🙂 Here below the code I used in case somebody interested.

My formType:

<?php
//src/Auth/UserBundle/Form/Type/RegistrationFormType.php
namespace Auth\UserBundle\Form\Type;

use Symfony\Component\Form\FormBuilderInterface;
use FOS\UserBundle\Form\Type\RegistrationFormType as BaseType;
use Doctrine\ORM\EntityRepository;
use Auth\GeoBundle\Form\LocalisationType;

use Auth\UserBundle\Form\EventListener\IsAdminFieldSubscriber;

class RegistrationFormType extends BaseType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        //NE PAS EFFACER -> exempled e comment ajouter un champ qui n'a rien à voir avec nos entitys
        //$builder->add("firstName", "text", array("mapped" => false));

        $builder->add('departement', 'genemu_jqueryselect2_entity', array(
            'mapped' => false,
            'empty_value' => '',
            'class' => 'AuthGeoBundle:Localisation',
            'property' => 'departement',
            'query_builder' => function ($repository) {
                return $repository
                    ->createQueryBuilder('e')
                    ->add('groupBy', 'e.departement')
                ;
            },
        ));


        $dpt = "";
        $builder->add('localisation', 'genemu_jqueryselect2_entity', array(
            'empty_value' => '',
            'class' => 'AuthGeoBundle:Localisation',
            'property' => 'formLabel',
            'query_builder' => function ($repository) use ($dpt) {
                return $repository
                    ->createQueryBuilder('e')
                    ->where('e.departement = :dpt')
                    ->setParameter('dpt', $dpt)
                    ->add('orderBy', 'e.ville ASC')
                ;
            },
        ));

        $builder->add('sexe', 'genemu_jqueryselect2_choice', array(
            'empty_value' => '',
            'choices'   => array(
                'homme'   => 'Homme',
                'femme' => 'Femme',
            ),
            'configs' => array(
                'minimumResultsForSearch' => 5,
            )
        ));

        $builder->add('date_naissance', 'date', array(
            'empty_value' => '',
            'widget' => 'choice',
            'attr' => array('class' => 'input-small'),
            'years' => range(1900,2100),
            'months' => range(1,12),
            'days' => range(1,31),
        ));

        $builder->add('petit_mot');

        $subscriber = new IsAdminFieldSubscriber($builder->getFormFactory());
        $builder->addEventSubscriber($subscriber);
    }


    public function getName()
    {
        return 'auth_user_registration';
    }
}

my EventListener:

<?php
//src/Auth/UserBundle/Form/EventListener/isAdminFieldSubscriber.php
namespace Auth\UserBundle\Form\EventListener;

use Symfony\Component\Form\Event\DataEvent;
use Symfony\Component\Form\FormFactoryInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Form\FormEvents;

class IsAdminFieldSubscriber implements EventSubscriberInterface
{
    /**
     * @var FormFactoryInterface 
     */
    private $factory;

    /**
     * @param FormFactoryInterface $factory 
     */
    public function __construct(FormFactoryInterface $factory)
    {
        $this->factory = $factory;
    }

    /**
     * @return array
     */
    public static function getSubscribedEvents()
    {
        return array(
            FormEvents::PRE_BIND => 'preBind',
        );
    }

    /**
     * Called before form data is set
     *
     * @param DataEvent $event
     */
    public function preBind(DataEvent $event)
    {
        $data = $event->getData();
        $form = $event->getForm();

        if (null === $data) {
            return;
        }

        $dpt = $data['localisation'];

        $form->add($this->factory->createNamed('localisation', 'entity', null, array(
            'empty_value' => '',
            'class' => 'AuthGeoBundle:Localisation',
            'property' => 'formLabel',
            'query_builder' => function ($repository) use ($dpt)  {
                return $repository
                    ->createQueryBuilder('e')
                    ->where('e.id = :dpt_id')
                    ->setParameter('dpt_id', $dpt)
                    ->add('orderBy', 'e.ville ASC')
                ;
            },
        )));
    }

}