Symfony2 Form - Event listener on Embed Form

Question

Starting from the example in the symfony cookbook about dynamic form generation (link to doc)

class SportMeetupType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('sport', 'entity', array(...))
        ;

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function(FormEvent $event) {
                $form = $event->getForm();

                // this would be your entity, i.e. SportMeetup
                $data = $event->getData();

                $positions = $data->getSport()->getAvailablePositions();

                $form->add('position', 'entity', array('choices' => $positions));
            }
        );
    }
}

I reproduced this code with a difference, I embed this form in a parent form (called for the exemple SportPlayerType).

SportPlayerType is mapped on entity SportPlayer which contains a couple of attributes : $name and $meetup, a string and a SportMeetup.

My problem is in the lambda function, parameter of the addEventListener :

$event->getForm() returns the child form SportMeetupType
$event->getData() returns the parent mapped entity SportPlayer

As a result, $form->add('position') throw an error because the FormBuilder cannot match position field on entity SportPlayer.

How could I force matching between SportMeetupType and entity SportMeetup when SportMeetupType in an embed form?

I usually just use a subscriber class so I'm not sure if this is the problem. The listener will get called twice. You should have a if !$data) return in there. And you might consider making a subscriber class though it really should not make any difference. — Cerad
– Cerad, Commented Nov 18, 2013 at 19:35
You should be able to access the embedded form. $form->get('sport'), assuming that it what this form is doing. — Flosculus
– Flosculus, Commented Nov 18, 2013 at 20:31
@Flosculus I already tried this solution, but the problem is not the form, it is the entity accessed from $event->getData() — maphe
– maphe, Commented Nov 18, 2013 at 20:51

Nicolai Fröhlich · Accepted Answer · 2013-11-19 08:56:38Z

1

We'll there is a reason the event is called PRE_SET_DATA ...

Namely the event gets fired before the submitted data is set.

Therefore you can't access ...

$event->getData()->getSport();

... in the listener as long as you don't provide a new Sport() object or an existing entity when creating the form i.e. in a controller like this:

$entity = new Sport(); // ... or get the entity from db
$form = $this->createForm(new SportMeetupType(), $entity);

Just use the POST_SET_DATA event and the data will be available.

edited Nov 19, 2013 at 8:56

answered Nov 19, 2013 at 8:45

Nicolai Fröhlich

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5 Comments

maphe Over a year ago

I tried this : $player = new SportPlayer(); $player->setSportMeetup(new SportMeetup()); $form = $this->createForm(new SportPlayerType(), $player); But the result is the same on PRE_SET_DATA and POST_SET_DATA events : Neither the property "position" nor one of the methods "getPosition()", "isPosition()", "hasPosition()", "__get()" or "__call()" exist and have public access in class "SportPlayer"

Nicolai Fröhlich Over a year ago

Well can you confirm that your SportPlayer class indeed does have a method getPosition() that returns the $position property ?

maphe Over a year ago

No. SportPlayer have a method getSportMeetup() returning a SportMeetup. SportMeetup have a method getposition(). This is the problem, data in the Event is a SportPlayer, but the form in the Event is mapped on the SportMeetup.

Nicolai Fröhlich Over a year ago

Then call $event->getData->getSportMeetup()->getPosition() ... and make sure you have $this->sportMeetup = new SportMeetup(); in the __construct() method of your SportPlayer class!

maphe Over a year ago

The error occurs when, in the EventListener, I add a new field in my form $form->add('position'). I know how to access to the position threw the SportMeetup getter, but how can I tell symfony to do the same on form creation ? Maybe it will be clearer if I tell you I tried, as a solution, to set the property_path of the position field to 'sportMeetup/position'...

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