Many to many relations Symfony2 - symfony

Question

I am using many to many relations in my symfony2 project, i have successfully made two entities 'Users' and Groups and i have also successfully persisted data which inserts data into users,groups and users_groups table by using
$user = new User();
$user->getGroups()->add($group);
now i want to edit the user which should also edit users_groups record..
I have searched a lot but no luck.Any help would be appreciated ...
CONTROLLER
public function editAction()
{
if($this->getRequest()->query->get("id")){
$id = $this->getRequest()->query->get("id");
$request = $this->getRequest();
$em = $this->getDoctrine()->getEntityManager();
$entity = $em->getRepository('DesignAppBundle:Users')->find($id);
$editForm = $this->createForm(new UserType());
if ($this->getRequest()->getMethod() == 'POST') {
$editForm->bindRequest($request);
if ($editForm->isValid()) {
$postData = $request->request->get('users');
$repository = $this->getDoctrine()
->getRepository('Bundle:groups');
$group = $repository->findOneById($postData['group']);
$entity->addGroups($group );
$em->flush();
return $this->redirect($this->generateUrl('index'));
}
}
return $this->render('User.html.twig',array(
'entity' => $entity,
'edit_form' => $editForm->createView(),
));
}
}
FORM
<?php
use and include .....
class UserType extends AbstractType
{
public function buildForm(FormBuilder $builder, array $options)
{
$request = Request::createFromGlobals();
$builder->add('group', 'entity', array(
'class' => 'Bundle:Groups',
'property' => 'name',
'empty_value' => 'All',
'required' => true,
'multiple'=>true,
'data' => $request->get('group_id')
));
}
public function getDefaultOptions(array $options)
{
return array(
'validation_groups' => array('users'),
'csrf_protection' => false,
);
}
public function getName()
{
return 'users';
}
}
User
/**
* #ORM\ManyToMany(targetEntity="Groups", inversedBy="users")
* #ORM\JoinTable(name="users_groups",
* joinColumns={#ORM\JoinColumn(name="user_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="group_id", referencedColumnName="id")}
* )
**/
protected $group;
public function __construct()
{
$this->group= new ArrayCollection();
}
public function addgroups(\Design\AppBundle\Entity\Categories $group)
{
$this->group[] = $group;
}
Group
/**
* #ORM\ManyToMany(targetEntity="Users", mappedBy="group")
*/
protected $users;
public function __construct()
{
$this->users= new ArrayCollection();
}
/**
* Add users
*
* #param Bundle\Entity\Users $users
*/
public function addUsers(Bundle\Users $users)
{
$this->users[] = $users;
}
/**
* Get users
*
* #return Doctrine\Common\Collections\Collection
*/
public function getUsers()
{
return $this->users;
}

Answer 1

You should not be adding the group_id, you should be adding the groups property
$builder->add('groups');
The group_id column is automatically handled by Doctrine and you should not be handling it yourself directly. Do you have a group_id property? If you do, you should remove it.
The group entity should be:
/**
* #ORM\ManyToMany(targetEntity="Users", mappedBy="group")
*/
protected $users;
public function __construct()
{
$this->users= new ArrayCollection();
}
/**
* Add users
*
* #param Bundle\Entity\User $user
*/
public function addUsers(Bundle\User $users)
{
$this->users[] = $users;
}
/**
* Get users
*
* #return Doctrine\Common\Collections\Collection
*/
public function getUsers()
{
return $this->users;
}
EDIT
This is how your controller should be:
public function editAction($request)
{
$id = $this->getRequest()->query->get("id");
$em = $this->getDoctrine()->getEntityManager();
$entity = $em->getRepository('DesignAppBundle:Users')->find($id);
$editForm = $this->createForm(new UserType(),$entity);
if ($this->getRequest()->getMethod() == 'POST') {
$editForm->bindRequest($request);
if ($editForm->isValid()) {
$em->persits($entity);
$em->flush();
return $this->redirect($this->generateUrl('index'));
}
}
return $this->render('User.html.twig',array(
'entity' => $entity,
'edit_form' => $editForm->createView(),
));
}
and this is how your UserType should be:
class UserType extends AbstractType
{
public function buildForm(FormBuilder $builder, array $options)
{
$builder->add('group', 'entity', array(
'class' => 'Bundle:Groups',
'property' => 'name',
'empty_value' => 'All',
'required' => true,
'multiple'=>true,
));
}
public function getDefaultOptions(array $options)
{
return array(
'validation_groups' => array('users'),
'csrf_protection' => false,
);
}
public function getName()
{
return 'users';
}
}