Missing an assigned ID for field - symfony

Question

I'm lost in a complexe relation (for me). I've a entity project for an entity client and you can attach users to a project. When i try to add a project without users, no problem. But, when i try to add a project and users Sf2 display this error :
Entity of type Intranet\IntranetBundle\Entity\ProjectUser is missing an assigned ID for field 'project'. The identifier generation strategy for this entity requires the ID field to be populated before EntityManager#persist() is called. If you want automatically generated identifiers instead you need to adjust the metadata mapping accordingly.
I'm understand it's angry because the project_id is null. But i don't know why it's null.
My Project.php
namespace Intranet\IntranetBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use Symfony\Component\Validator\Constraints as Assert;
/**
* Project
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="Intranet\IntranetBundle\Entity\ProjectRepository")
*/
class Project
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
* #Assert\NotBlank(
* message = "The field cannot be empty"
* )
*/
private $name;
/**
* #Gedmo\Slug(fields={"name"})
* #ORM\Column(length=255, unique=true)
*/
private $slug;
/**
* #var string
*
* #ORM\Column(name="contact_client", type="text", nullable=true)
*/
private $contactClient;
/**
* #var string
*
* #ORM\Column(name="technologies", type="string", length=255, nullable=true)
*/
private $technologies;
/**
* #var string
*
* #ORM\Column(name="languages", type="string", length=255, nullable=true)
*/
private $languages;
/**
* #var string
*
* #ORM\Column(name="extern", type="text", nullable=true)
*/
private $extern;
/**
* #var string
*
* #ORM\Column(name="url_prod", type="string", length=255, nullable=true)
*/
private $urlProd;
/**
* #var string
*
* #ORM\Column(name="url_staging", type="text", nullable=true)
*/
private $urlStaging;
/**
* #var string
*
* #ORM\Column(name="url_dev", type="text", nullable=true)
*/
private $urlDev;
/**
* #var string
*
* #ORM\Column(name="hosting_company", type="string", length=255, nullable=true)
*/
private $hostingCompany;
/**
* #var string
*
* #ORM\Column(name="hosting_type", type="string", length=255, nullable=true)
*/
private $hostingType;
/**
* #var string
*
* #ORM\Column(name="hosting_manager", type="text", nullable=true)
*/
private $hostingManager;
/**
* #var string
*
* #ORM\Column(name="ssh", type="text", nullable=true)
*/
private $ssh;
/**
* #var string
*
* #ORM\Column(name="ftp", type="text", nullable=true)
*/
private $ftp;
/**
* #var string
*
* #ORM\Column(name="db", type="text", nullable=true)
*/
private $db;
/**
* #var string
*
* #ORM\Column(name="emails", type="text", nullable=true)
*/
private $emails;
/**
* #var string
*
* #ORM\Column(name="cms", type="text", nullable=true)
*/
private $cms;
/**
* #var string
*
* #ORM\Column(name="web_services", type="text", nullable=true)
*/
private $webServices;
/**
* #var string
*
* #ORM\Column(name="comment", type="text", nullable=true)
*/
private $comment;
/**
* #ORM\ManyToOne(targetEntity="Intranet\IntranetBundle\Entity\Client", inversedBy="projects")
* #ORM\JoinColumn(nullable=false)
*/
private $client;
/**
* #ORM\OneToMany(targetEntity="Intranet\IntranetBundle\Entity\ProjectUser", mappedBy="project", cascade={"persist"})
*/
private $projectUsers;
public function __construct()
{
$this->projectUsers = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
* #return Project
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set slug
*
* #param string $slug
* #return Client
*/
public function setSlug($slug)
{
$this->slug = $slug;
return $this;
}
/**
* Get slug
*
* #return string
*/
public function getSlug()
{
return $this->slug;
}
/**
* Set contactClient
*
* #param string $contactClient
* #return Project
*/
public function setContactClient($contactClient)
{
$this->contactClient = $contactClient;
return $this;
}
/**
* Get contactClient
*
* #return string
*/
public function getContactClient()
{
return $this->contactClient;
}
/**
* Set technologies
*
* #param string $technologies
* #return Project
*/
public function setTechnologies($technologies)
{
$this->technologies = $technologies;
return $this;
}
/**
* Get technologies
*
* #return string
*/
public function getTechnologies()
{
return $this->technologies;
}
/**
* Set languages
*
* #param string $languages
* #return Project
*/
public function setLanguages($languages)
{
$this->languages = $languages;
return $this;
}
/**
* Get languages
*
* #return string
*/
public function getLanguages()
{
return $this->languages;
}
/**
* Set extern
*
* #param string $extern
* #return Project
*/
public function setExtern($extern)
{
$this->extern = $extern;
return $this;
}
/**
* Get extern
*
* #return string
*/
public function getExtern()
{
return $this->extern;
}
/**
* Set urlProd
*
* #param string $urlProd
* #return Project
*/
public function setUrlProd($urlProd)
{
$this->urlProd = $urlProd;
return $this;
}
/**
* Get urlProd
*
* #return string
*/
public function getUrlProd()
{
return $this->urlProd;
}
/**
* Set urlStaging
*
* #param string $urlStaging
* #return Project
*/
public function setUrlStaging($urlStaging)
{
$this->urlStaging = $urlStaging;
return $this;
}
/**
* Get urlStaging
*
* #return string
*/
public function getUrlStaging()
{
return $this->urlStaging;
}
/**
* Set urlDev
*
* #param string $urlDev
* #return Project
*/
public function setUrlDev($urlDev)
{
$this->urlDev = $urlDev;
return $this;
}
/**
* Get urlDev
*
* #return string
*/
public function getUrlDev()
{
return $this->urlDev;
}
/**
* Set hostingCompany
*
* #param string $hostingCompany
* #return Project
*/
public function setHostingCompany($hostingCompany)
{
$this->hostingCompany = $hostingCompany;
return $this;
}
/**
* Get hostingCompany
*
* #return string
*/
public function getHostingCompany()
{
return $this->hostingCompany;
}
/**
* Set hostingType
*
* #param string $hostingType
* #return Project
*/
public function setHostingType($hostingType)
{
$this->hostingType = $hostingType;
return $this;
}
/**
* Get hostingType
*
* #return string
*/
public function getHostingType()
{
return $this->hostingType;
}
/**
* Set hostingManager
*
* #param string $hostingManager
* #return Project
*/
public function setHostingManager($hostingManager)
{
$this->hostingManager = $hostingManager;
return $this;
}
/**
* Get hostingManager
*
* #return string
*/
public function getHostingManager()
{
return $this->hostingManager;
}
/**
* Set ssh
*
* #param string $ssh
* #return Project
*/
public function setSsh($ssh)
{
$this->ssh = $ssh;
return $this;
}
/**
* Get ssh
*
* #return string
*/
public function getSsh()
{
return $this->ssh;
}
/**
* Set ftp
*
* #param string $ftp
* #return Project
*/
public function setFtp($ftp)
{
$this->ftp = $ftp;
return $this;
}
/**
* Get ftp
*
* #return string
*/
public function getFtp()
{
return $this->ftp;
}
/**
* Set db
*
* #param string $db
* #return Project
*/
public function setDb($db)
{
$this->db = $db;
return $this;
}
/**
* Get db
*
* #return string
*/
public function getDb()
{
return $this->db;
}
/**
* Set emails
*
* #param string $emails
* #return Project
*/
public function setEmails($emails)
{
$this->emails = $emails;
return $this;
}
/**
* Get emails
*
* #return string
*/
public function getEmails()
{
return $this->emails;
}
/**
* Set cms
*
* #param string $cms
* #return Project
*/
public function setCms($cms)
{
$this->cms = $cms;
return $this;
}
/**
* Get cms
*
* #return string
*/
public function getCms()
{
return $this->cms;
}
/**
* Set webServices
*
* #param string $webServices
* #return Project
*/
public function setWebServices($webServices)
{
$this->webServices = $webServices;
return $this;
}
/**
* Get webServices
*
* #return string
*/
public function getWebServices()
{
return $this->webServices;
}
/**
* Set comment
*
* #param string $comment
* #return Project
*/
public function setComment($comment)
{
$this->comment = $comment;
return $this;
}
/**
* Get comment
*
* #return string
*/
public function getComment()
{
return $this->comment;
}
/**
* Set client
*
* #param \Intranet\IntranetBundle\Entity\Client $client
* #return Project
*/
public function setClient(\Intranet\IntranetBundle\Entity\Client $client)
{
$this->client = $client;
return $this;
}
/**
* Get client
*
* #return \Intranet\IntranetBundle\Entity\Client
*/
public function getClient()
{
return $this->client;
}
public function addProjectUser(\Intranet\IntranetBundle\Entity\ProjectUser $projectUser)
{
$this->projectUsers[] = $projectUser;
}
public function removeProjectUser(\Intranet\IntranetBundle\Entity\ProjectUser $projectUser)
{
$this->projectUsers->removeElement($projectUser);
}
public function getProjectUsers()
{
return $this->projectUsers;
}
}
My ProjectUser.php
namespace Intranet\IntranetBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
*/
class ProjectUser
{
/**
* #ORM\Id
* #ORM\ManyToOne(targetEntity="Intranet\IntranetBundle\Entity\Project", inversedBy="projectUsers")
*/
private $project;
/**
* #ORM\Id
* #ORM\ManyToOne(targetEntity="Intranet\UserBundle\Entity\User")
*/
private $user;
/**
* #ORM\Column(name="profil", type="smallint")
*/
private $profil;
public function setProject(\Intranet\IntranetBundle\Entity\Project $project)
{
$project->addProjectUser($this);
$this->project = $project;
}
public function getProject()
{
return $this->project;
}
public function setUser(\Intranet\UserBundle\Entity\User $user)
{
$this->user = $user;
}
public function getUser()
{
return $this->user;
}
public function setProfil($profil)
{
$this->profil = $profil;
}
public function getProfil()
{
return $this->profil;
}
}
profil = smallint for the job of the user (1=manager, 2=designer, ...)
My ProjectController (addAction)
public function addAction()
{
$project = new Project;
$form = $this->createForm(new ProjectType, $project);
$request = $this->get('request');
if ($request->getMethod() == 'POST') {
$form->bind($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($project);
$em->flush();
foreach ($form->get('projectUsers')->getData() as $u) {
$u->setProject($project);
$em->persist($u);
}
$em->flush();
$this->get('session')->getFlashBag()->add('success', 'The project : '. $project->getName() .' has been added');
return $this->redirect($this->generateUrl('clients_list'));
}
}
return $this->render('IntranetIntranetBundle:Project:add_project.html.twig', array(
'form' => $form->createView()
));
}
Thanks for your help

Answer 1

Well, first of all, you shouldn't specify #ORM\Id annotation on every foreign key in your ProjectUser entity - it is for primary keys.
Then you should declare column join on foreign key fields:
/**
* #ORM\ManyToOne(targetEntity="Intranet\IntranetBundle\Entity\Project", inversedBy="projectUsers")
* #ORM\JoinColumn(name="project_id", referencedColumnName="id")
*/
private $project;
/**
* #ORM\ManyToOne(targetEntity="Intranet\IntranetBundle\Entity\User", inversedBy="projects")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $user;
You also should have a field like
class User
{
// ...
/**
* #ORM\OneToMany(targetEntity="Intranet\IntranetBundle\Entity\ProjectUser", mappedBy="user")
*/
private $projects;
// ...
}
Finally, to add user to project, I suggest you embed a ProjectUserType form with user selection into ProjectType form. In your controller, you can have something like
public function addAction()
{
$project = new Project;
$projectUser = new ProjectUser();
$projectUser->setProject($project);
$project->addProjectUser($projectUser);
$form = $this->createForm(new ProjectType, $project);
// ...
And in form ProjectUserType
class ProjectUserType extends AbstractType {
public function buildForm(FormBuilderInterface $builder, array $options) {
$builder->add('user', 'entity', array(
'class' => 'Intranet:IntranetBundle:User'
));
// ...
Hope this helps at least a little bit.

Answer 2

When you code : $em->persist($project);
$project is equal to $project = new Project; (don't you have forget '()' ?)
Actually the $projet is empty... To do this, I think you forget to code :
$project = $form->getData();