Doctrine2 inverse persistance not working in nested forms - forms

Question

I am creating a MotorsAds entity to which I am linking with MotorsAdsFile entity. For each MotorsAds, we could attach many MotorsAdsFile.
My objective is creating a form for MotorsAds which allows adding MotorsAdsFile just through a click on a button. Here, I am trying to implement the embeded forms.
My problem is that I got that error:
An exception occurred while executing 'INSERT INTO MotorsAdsFile (filename, motors_id) VALUES (?, ?)' with params ["5493b613839d7_2012-07-02 22.06.00.jpg", null]:
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'motors_id' cannot be null
Probably, the MotorsAds object is not persisted yet: that's why the Column 'motors_id' is null. Could you help in this issue?
Have I missed something?
1. Definition of the entities
MotorsAdsFile
<?php
namespace Minn\AdsBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Symfony\Component\Validator\Constraints as Assert;
use Vich\UploaderBundle\Mapping\Annotation as Vich;
/**
* #ORM\Entity
* #Vich\Uploadable
*/
class MotorsAdsFile {
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
public $id;
/**
* #Assert\File(
* maxSize="5M",
* mimeTypes={"image/png", "image/jpeg"}
* )
* #Vich\UploadableField(mapping="motors_files", fileNameProperty="filename")
*/
protected $file;
/**
* #ORM\Column(type="string", length=255, name="filename")
* #var string $filename
*/
protected $filename;
/**
* #ORM\ManyToOne(targetEntity="Minn\AdsBundle\Entity\MotorsAds", inversedBy="files")
* #ORM\JoinColumn(nullable=false,onDelete="CASCADE")
*/
private $motors;
/**
* #param File|\Symfony\Component\HttpFoundation\File\UploadedFile $file
*/
public function setFile(File $file) {
$this->file = $file;
}
/**
* #return File
*/
public function getFile() {
return $this->file;
}
/**
* #param string $filename
*/
public function setFilename($filename) {
$this->filename = $filename;
}
/**
* #return string
*/
public function getFilename() {
return $this->filename;
}
/**
* Set motors
*
* #param \Minn\AdsBundle\Entity\MotorsAds $motors
* #return MotorsAds
*/
public function setMotors(\Minn\AdsBundle\Entity\MotorsAds $motors) {
$this->motors = $motors;
return $this;
}
/**
* Get motors
*
* #return \Minn\AdsBundle\Entity\MotorsAds
*/
public function getMotors() {
return $this->motors;
}
}
MotorsAds
<?php
namespace Minn\AdsBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use Symfony\Component\Validator\Constraints as Assert;
/**
* MotorsAds
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="Minn\AdsBundle\Entity\MotorsAdsRepository")
* #ORM\HasLifecycleCallbacks()
*/
class MotorsAds {
// ...
/**
* #ORM\OneToMany(targetEntity="Minn\AdsBundle\Entity\MotorsAdsFile",
* mappedBy="motors",
* cascade={"persist", "remove"})
* #ORM\JoinColumn(nullable=true)
*/
private $files;
public function __construct() {
$this->files = new \Doctrine\Common\Collections\ArrayCollection();
$this->favorites = new \Doctrine\Common\Collections\ArrayCollection();
}
public function getFiles() {
return $this->files;
}
public function addFile(MotorsAdsFile $file) {
$this->files[] = $file;
return $this;
}
public function removeFile(MotorsAdsFile $file) {
$this->files->removeElement($file);
}
// ...
}
2. The forms
MotorsAdsFileType
class MotorsAdsFileType extends AbstractType {
public function buildForm(FormBuilderInterface $builder, array $options) {
$builder->add('file', 'file',array('required' => false));
}
public function setDefaultOptions(OptionsResolverInterface $resolver) {
$resolver->setDefaults(array(
'data_class' => 'Minn\AdsBundle\Entity\MotorsAdsFile'
));
}
public function getName() {
return 'MotorsAdsFiletype';
}
}
MotorsAdsType
class MotorsAdsType extends AbstractType {
public function buildForm(FormBuilderInterface $builder, array $options) {
// ...some code here
$builder->add('files','collection',array('type'=> new MotorsAdsFileType(),
'allow_add'=> true,
'allow_delete' => true,
'by_reference' => true));
}
public function setDefaultOptions(OptionsResolverInterface $resolver) {
$resolver->setDefaults(array(
'data_class' => 'Minn\AdsBundle\Entity\MotorsAds'
));
}
public function getName() {
return 'MotorsAdstype';
}
}
I

Answer 1

I found the solution...
Two things have to be done:
(1)
public function buildForm(FormBuilderInterface $builder, array $options) {
// ...some code here
$builder->add('files','collection',array('type'=> new MotorsAdsFileType(),
'allow_add'=> true,
'allow_delete' => true,
'by_reference' => false)); // it has to be set to false and not true
}
(2)
public function addFile(MotorsAdsFile $file) {
$file->setMotors($this); // you have to add this line too
$this->files[] = $file;
return $this;
}