Doctrine doesn't link to associations - php

Question

I'm trying to add entries to a MySQL database by using a REST endpoint in a Symfony 3.1 app (and PHP 7.1).
I have two entities: Role and Permission, in a many to many relationship.
/**
* Role
*
* #ORM\Table(name="role")
* #ORM\Entity(repositoryClass="DruideBundle\Entity\Repository\RoleRepository")
*
*/
class Role
{
/**
* #var string
* #ORM\Column(name="titre", type="string", length=100, nullable=false)
*/
private $titre = '';
/**
* #var integer
*
* #ORM\Column(name="id_role", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $idRole;
/**
* #var \Doctrine\Common\Collections\Collection
* #Type("array<DruideBundle\Entity\Permission>")
* #ORM\ManyToMany(targetEntity="DruideBundle\Entity\Permission", mappedBy="idRole", cascade={"persist", "remove"})
*/
private $idPermission;
/**
* #return string
*/
public function getTitre() {
return $this->titre;
}
/**
* #param string $titre
*/
public function metsTitre($titre) {
$this->titre = $titre;
}
/**
* #param string $titre
*/
public function setTitre($titre) {
$this->titre = $titre;
}
public function getId() {
return $this->idRole;
}
public function addIdPermission($permission) {
$this->idPermission->add($permission);
}
public function removeIdPermission($permission) {
$this->idPermission->remove($permission);
}
public function setIdPermission($permission) {
$this->idPermission = $permission;
}
public function getIdPermission() {
return $this->idPermission;
}
/**
* Constructor
*/
public function __construct()
{
$this->idPermission = new \Doctrine\Common\Collections\ArrayCollection();
}
}
/**
* Permission
*
* #ORM\Table(name="permission", uniqueConstraints={#ORM\UniqueConstraint(name="valeur", columns={"cle"})})
* #ORM\Entity(repositoryClass="DruideBundle\Entity\Repository\PermissionRepository")
*/
class Permission
{
/**
* #var string
*
* #ORM\Column(name="cle", type="string", length=100, nullable=true)
*/
private $cle;
/**
* #return string
*/
public function getCle() {
return $this->cle;
}
/**
* #param string $cle
*/
public function metsCle($cle) {
$this->cle = $cle;
}
/**
* #param string $cle
*/
public function setCle($cle) {
$this->cle = $cle;
}
/**
* #return string
*/
public function getDescription() {
return $this->description;
}
/**
* #param string $description
*/
public function metsDescription($description) {
$this->description = $description;
}
/**
* #param string $description
*/
public function setDescription($description) {
$this->description = $description;
}
public function getId() {
return $this->idPermission;
}
/**
* #var string
*
* #ORM\Column(name="description", type="string", length=255, nullable=true)
*/
private $description;
/**
* #var integer
*
* #ORM\Column(name="id_permission", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $idPermission;
/**
* #var \Doctrine\Common\Collections\Collection
*
* #ORM\ManyToMany(targetEntity="DruideBundle\Entity\Role", inversedBy="idPermission")
* #ORM\JoinTable(name="role_permission",
* joinColumns={
* #ORM\JoinColumn(name="id_permission", referencedColumnName="id_permission")
* },
* inverseJoinColumns={
* #ORM\JoinColumn(name="id_role", referencedColumnName="id_role")
* }
* )
*/
private $idRole;
/**
* Constructor
*/
public function __construct()
{
$this->idRole = new \Doctrine\Common\Collections\ArrayCollection();
}
}
class RoleType extends AbstractType
{
/**
* {#inheritdoc}
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('titre', TextType::class)->
add('idPermission', CollectionType::class, array('entry_type' => PermissionType::class));
}
/**
* {#inheritdoc}
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'DruideBundle\Entity\Role', 'allow_extra_fields' => true
));
}
/**
* {#inheritdoc}
*/
public function getBlockPrefix()
{
return 'druidebundle_role';
}
}
class RoleController extends FOSRestController implements ClassResourceInterface
{
public function postAction(Request $request)
{
$form = $this->createForm(RoleType::class, null, [
'csrf_protection' => false,
]);
$form->submit($request->request->all());
if (!$form->isValid()) {
return View::create($form->getErrors(true), Response::HTTP_BAD_REQUEST);
}
/**
* #var $role Role
*/
$role = $form->getData();
$em = $this->getDoctrine()->getManager();
$em->persist($role);
$em->flush();
$routeOptions = [
'id' => $role->getId(),
'_format' => $request->get('_format'),
];
$reponse = $this->routeRedirectView('get_roles', $routeOptions, Response::HTTP_CREATED);
return $this->handleView($reponse);
}
Now, if I send this JSON to create a new role:
{ "titre": "Test Pascal", "permissions": [ { "id": 1 }, { "id": 3 } ] }
I would expect it to create a new Role, and make links to the two existing permissions. Sadly, Doctrine is only creating the Role entity:
[2017-12-04 21:02:08] doctrine.DEBUG: "START TRANSACTION" [] []
[2017-12-04 21:02:08] doctrine.DEBUG: INSERT INTO role (titre) VALUES (?) {"1":"Test Pascal"} []
[2017-12-04 21:02:08] doctrine.DEBUG: "COMMIT" [] []
What is missing?