Relation ManyToMany with doctrine/symfony3 - doctrine-orm

Question

I would like to create a ManyToMany relationship with Symfony3/doctrine (The entities are 'Categorie' and 'Service')
So I have two forms to create this entites.
The first form (Categorie) works properly but not the second (Service) : The new service is not related to categories, i don't understand :
Categorie.php
/**
* Categorie
*
* #ORM\Table(name="categorie")
* #ORM\Entity(repositoryClass="GestionBundle\Repository\CategorieRepository")
*/
class Categorie
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToMany(targetEntity="Service", inversedBy="categories")
*/
private $services;
/**
* Categorie constructor.
*/
public function __construct()
{
$this->services = new ArrayCollection();
}
[...]
}
Service.php
/**
* Service
*
* #ORM\Table(name="service")
* #ORM\Entity(repositoryClass="GestionBundle\Repository\ServiceRepository")
*/
class Service
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToMany(targetEntity="Categorie", mappedBy="services")
*/
private $categories;
/**
* #var string
*
* #ORM\Column(name="nom", type="string", length=255, unique=true)
*/
private $nom;
/**
* Categorie constructor.
*/
public function __construct()
{
$this->categories = new ArrayCollection();
}
[...]
}
CategorieType.php
class CategorieType extends AbstractType
{
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nom')
->add('services', EntityType::class, array(
'class' => 'GestionBundle:Service',
'choice_label' => 'nom',
'multiple' => true,
'required' => false))
->add('Ajouter', SubmitType::class)
;
}
[...]
}
ServiceType.php
class ServiceType extends AbstractType
{
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nom')
->add('categories', EntityType::class, array(
'class' => 'GestionBundle:Categorie',
'choice_label' => 'nom',
'multiple' => true,
'required' => false))
->add('Ajouter', SubmitType::class)
;
}
[...]
}
Controller :
/**
* #Route("/Categories/Creation", name="route_gestion_eltcoord_categories_creation")
* #Template()
*/
public function CreationCategorieAction(Request $request)
{
$Categorie = new Categorie();
$form = $this->createForm(CategorieType::class, $Categorie);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($Categorie);
$em->flush();
return $this->redirectToRoute('route_gestion_eltcoord_categories');
}
return array('form' => $form->createView());
}
/**
* #Route("/Services/Creation", name="route_gestion_eltcoord_services_creation")
* #Template()
*/
public function CreationServiceAction(Request $request)
{
$Service = new Service();
$form = $this->createForm(ServiceType::class, $Service);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($Service);
$em->flush();
return $this->redirectToRoute('route_gestion_eltcoord_services');
}
return array('form' => $form->createView());
}
Thank you.

Answer 1

As I understand you wan't nested form from category root form ?
Try CollectionType::class instead of EntityType::class in service form builder, configure options (at less entry_type to map entity class).
Related documentation for configuration here.
And here there is example from Symfony cookbook.

Answer 2

In a ManyToMany relations you must create a joined table like in this post, so in that way doctrine can create a third entity for describe the relation.
Hope this help you.

Answer 3

I already have the joined table.
Here is an example :
New 'Service' S1 (Form Service) :
Service Categorie categorie_service
+------+-------+ +------+-------+ +--------+--------+
| id | Name | | id | Name | | id_c | id_s |
+------+-------+ +------+-------+ +--------+--------+
| 1 | S1 |
+------+-------+
New 'Categorie' C1 related to S1 (Form Categorie) :
Service Categorie categorie_service
+------+-------+ +------+-------+ +--------+--------+
| id | Name | | id | Name | | id_c | id_s |
+------+-------+ +------+-------+ +--------+--------+
| 1 | S1 | | 1 | C1 | | 1 | 1 |
+------+-------+ +------+-------+ +--------+--------+
New 'Service' S2 related to C1 (Form Service) :
Service Categorie categorie_service
+------+-------+ +------+-------+ +--------+--------+
| id | Name | | id | Name | | id_c | id_s |
+------+-------+ +------+-------+ +--------+--------+
| 1 | S1 | | 1 | C1 | | 1 | 1 |
+------+-------+ +------+-------+ +--------+--------+
| 2 | S2 |
+------+-------+
doesn't work ...
I should have this:
categorie_service
+--------+--------+
| id_c | id_s |
+--------+--------+
| 1 | 1 |
+--------+--------+
| 1 | 2 |
+--------+--------+
;p

Answer 4

I added this :
$categories = $form->getData()->getCategories();
foreach ($categories as $categorie) {
$categorie->addService($service);
}
into 'CreationServiceAction' and before call $em->persist...
Now it's ok.