Symfony4 form - preselection in Collection of Entities - php

Question

I have two entities with a Many->Many relation , appli and service
I want to create a form that would allow me to edit, add, or remove relations .
Those entities are linked as follow ..
Appli.php :
/**
* #ORM\ManyToMany(targetEntity="App\Entity\Service", mappedBy="applis")
*/
private $services;
public function getService() {
return $this->services;
}
Service.php :
/**
* #ORM\ManyToMany(targetEntity="App\Entity\Appli", inversedBy="services")
* #ORM\JoinTable(name="service_to_app",
* joinColumns={#ORM\JoinColumn(name="services", referencedColumnName="id_service")},
* inverseJoinColumns={#ORM\JoinColumn(name="applis", referencedColumnName="id_apps")}
* )
*/
private $applis;
Notice that $services and $applis are arrayCollections .
Here is my formType :
public function buildForm(FormBuilderInterface $builder, array $options)
{
$item = $builder->getData();
$builder /* ... */
->add('serviceCol', CollectionType::class, array(
'entry_type' => ServiceType::class,
'entry_options' => array('label' => false,),
'property_path' => 'service',
'allow_add' => true, 'allow_delete' => true,
));
}
public function configureOptions(OptionsResolver $resolver) {
$resolver->setDefaults(array(
'data_class' => Appli::class,
));
}
and the serviceType :
class ServiceType extends AbstractType {
public function buildForm(FormBuilderInterface $builder, array $options) {
$builder
->add('service', EntityType::class, array(
'class' => Service::class,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('s')
->orderBy('s.id_service', 'ASC');},
'choice_label' => 'nom', 'property_path' => 'nom', 'label' => false));
}
public function configureOptions(OptionsResolver $resolver) {
$resolver->setDefaults(array(
'data_class' => Service::class,
));
}
}
My issue so far is to preselect relations, I do have the correct amount of fields , but it's only default value and does not show the existing relations .
I could get to it without using the CollectionType field , but then , I would not be able to add / remove fields .
I cant fill the 'data' option since $item->getService() gives an arrayCollection , and I could not find a way to iterate through it during the Collection definition .
Is there any simple enough solution to this ?

Answer 1

So the fix was quite simple , the solution was on Symfony form - Access Entity inside child entry Type in a CollectionType
It also made me read How to Dynamically Modify Forms Using Form Events with a renewed attention !
here s is my ServiceType formBuilder :
$builder->addEventListener(FormEvents::PRE_SET_DATA,
function (FormEvent $event) use ($builder) {
$form = $event->getForm();
$service = $event->getData();
if($service instanceof Service) {
$form->add('service', EntityType::class, array(
'class' => Service::class,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('s')
->orderBy('s.id_service', 'ASC');},
'choice_label' => 'nom',
'property_path' => 'nom',
'label' => false,
'data' => $service ));
}
})
;