How to update a manyToMany collection of an entity in onFlush event listener?

Question

I have this entity: ``` <?php namespace Comakai\MyBundle\Entity; use Doctrine\ORM\Mapping as ORM, Symfony\Component\Validator\Constraints as Assert; /** * @ORM\Entity */ class Stuff { /** * @ORM\Id * @ORM\Column(type="integer") * @ORM\GeneratedValue(strategy="IDENTITY") */ private $id; /** * @ORM\Column(type="text") * @Assert\NotBlank() */ private $content; /** * @ORM\ManyToMany(targetEntity="Apple", cascade={"persist"}) */ private $apples; /** * @ORM\ManyToMany(targetEntity="Pig") */ private $pigs; public function __construct() { $this->apples = new \Doctrine\Common\Collections\ArrayCollection(); $this->pigs = new \Doctrine\Common\Collections\ArrayCollection(); } public function setApples($apples) { $this->getApples()->clear(); foreach ($apples as $apple) { $this->addApple($apple); } } public function setPigs($pigs) { $this->getPigs()->clear(); foreach ($pigs as $pig) { $this->addPig($pig); } } /** * Get id * * @return integer */ public function getId() { return $this->id; } /** * Se…

Accepted Answer

When updating an entity during a listener's onFlush event, all you need to call is `computeChangeSet()`:

```
// make changes to entity
$entity->field = 'value';

// or assign an existing entity to an assocation
$entity->user = $myExistingUserEntity;
$entity->tags->add($myExistingTagEntity);

$meta = $em->getClassMetadata(get_class($entity));
$uow->computeChangeSet($meta, $entity);
```

If you're creating other entities too, you need to persist them and compute their changes first!

```
$myNewUserEntity = new Entity\User;
$myNewTagEntity = new Entity\Tag;

$entity->user = $myNewUserEntity;
// make sure you call add() on the owning side for *ToMany associations
$entity->tags->add($myNewTagEntity);

$em->persist($myNewUserEntity);
$em->persist($myNewTagEntity);

$metaUser = $em->getClassMetadata(get_class($myNewUserEntity));
$uow->computeChangeSet($metaUser, $myNewUserEntity);

$metaTag = $em->getClassMetadata(get_class($myNewTagEntity));
$uow->computeChangeSet($metaTag, $myNewTagEntity);

$meta = $em->getClassMetadata(get_class($entity));
$uow->computeChangeSet($meta, $entity);
```

How to update a manyToMany collection of an entity in onFlush event listener?

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