Symfony Forms persist multiple EntityType - symfony

Question

I have no problem to persist from ManytoMany(normal) and ManytoOne, however, I don't understand the proper way to persist entity from OnetoMany and ManytoMany(Reversed).
Here is an example :
ExampleEntity :
...
/**
* #var ArrayCollection $myentities
*
* #ORM\OneToMany(targetEntity="AppBundle\Entity\Myentity", mappedBy="exampleentity", cascade={"persist"})
*/
private $myentities;
// getters/setters
/*
public function addMyentity(Myentity $myentitie)
public function removeMyentity(Myentity $myentitie)
public function getMyentities()
public function setMyentities(ArrayCollection $myentities)
*/
...
Form :
...
->add('myentities', 'Symfony\Bridge\Doctrine\Form\Type\EntityType', array(
'class' => 'AppBundle\Entity\Myentity',
'multiple' => true
))
...
Controller :
...
if ($form->handleRequest($request)->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($exampleentity);
$em->flush();
}
}
...
So here is the problem, add and remove function are never called, so all "$myentities" are never persist correcly.
I try to update my form with "by_reference => false" but it is not documented for EntityType (and also create other errors).
I try to change my controller but during edit how detect which one have been select (easy) and which ones have been unselected (not easy or not optimised) ?
Doctrine is not supposed to simplify theses kind of tasks ?

Answer 1

Solution in case anyone stumbles upon this same problem:
You need to have proper setters/getters:
class MyEntity
{
/**
* #var Groupe[]|ArrayCollection
*
* #ORM\OneToMany(targetEntity="Groupe", mappedBy="otherEntity")
*/
protected $notifyGroupsOnNewMail;
public function addNotifyGroupsOnNewMail(Groupe $notifyGroupsOnNewMail): self
{
if (!$this->notifyGroupsOnNewMail->contains($notifyGroupsOnNewMail))
{
$this->notifyGroupsOnNewMail[] = $notifyGroupsOnNewMail;
$notifyGroupsOnNewMail->setMyEntity($this);
}
return $this;
}
public function removeNotifyGroupsOnNewMail(Groupe $notifyGroupsOnNewMail): self
{
if ($this->notifyGroupsOnNewMail->contains($notifyGroupsOnNewMail))
{
$this->notifyGroupsOnNewMail->removeElement($notifyGroupsOnNewMail);
// set the owning side to null (unless already changed)
if ($notifyGroupsOnNewMail->getMyEntity() === $this)
{
$notifyGroupsOnNewMail->setMyEntity(null);
}
}
return $this;
}
}
But also have 'by_reference' => false in your form, otherwise your setters are not called, and therefore trying to persist from the reverse side will not save anything:
->add('notifyGroupsOnNewMail', EntityType::class, [
'class' => Groupe::class,
'required' => false,
'multiple' => true,
'by_reference' => false
])

Answer 2

Did you check if during the post request, added child elements has been sent to the server?
If you are using form prototype, maybe you have to check input index.