Symfony extends a form with dependencies from submit data - symfony-forms

Question

I am trying to extends my form, but I dont know how to do it ...
The problem
My parent formType depends of a option. But I want provide that option from the child form. In symfony documentation they explain a method to add dynamic fields that depends on submit data. But if It have a field with DataTransformer?, because in FormInterface I can't add it.
The code
class TransactionApiType extends AbstractApiType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$app = $options['app'];
$builder
->add('gamer', TextType::class)->addModelTransformer(new GamerExternalIdToStringCreateIfNotExistTransformer($em, $app))
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => Transaction::class,
))
->setAllowedTypes('app', ['AppBundle\Entity\App'])
;
}
}
class TransactionMultiAppConfByAppApiType extends TransactionApiType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('app_id',
EntityType::class,
[
'property_path' => 'app',
'required' => true,
'description' => 'App id',
'class' => App::class,
])
;
// I need pass $options['app'] here to work (App will be submitted),
// How can do? or other possibilities
parent::buildForm($builder, $options);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => Transaction::class,
)
;
}
}
Thanks in advance :-)

Answer 1

Add fields with DataTransformers in formEvents are not enabled https://github.com/symfony/symfony/issues/9355
But there is a "hack"
related here Symfony2 form events and model transformers (Summary it needs create a customType...)
My solution was
class TransactionMultiAppConfByAppApiType extends TransactionApiType
{
// ...
parent::buildForm($builder, $options);
$optionsApp = $builder->get('gamer')->getAttributes()['data_collector/passed_options'];
$builder->remove('gamer');
$builder->get('app_id')->addEventListener(
FormEvents::POST_SUBMIT,
function (FormEvent $event) use ($em, $optionsApp) {
/** #var App $app */
$app = $event->getForm()->getData();
$f = $event->getForm()->getParent();
if ($app)
{
$f
->add('gamer', GamerIdWithExternalIdCustomType::class, $optionsApp + ['em' => $em, 'app' => $app])
;
}
});
// ...
}
class GamerIdWithExternalIdCustomType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->addModelTransformer(new GamerExternalIdToStringCreateIfNotExistTransformer($options['em'], $options['app']));
}
public function getParent()
{
return TextType::class;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver
->setRequired([
'em',
'app',
]);
}
}