Symfony form errors - symfony

Question

I have 3 Entity Client, Classes, Fournitures. Client has an OnetoMany relations with Fournitures and Fourniteurs has a ManytoOne relations with Classes, to do this I make a nest fields for the Client form as here is the ClientType:
$builder->add('nom')
->add('adresse')
->add('idfournitures', FournituresType::class);
FournituresType
$builder->add('nom')
->add('value')
->add('prix')
->add('idclasses', ClassesType::class);
ClassesType
$builder->add('categories')
->add('famille');
the form is fine but the problem now is that during my newAction, it returns the error : A new entity was found through the relationship 'AppBundle\Entity\Fournitures#idclasses' that was not configured to cascade persist operations for entity. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example #ManyToOne(..,cascade={"persist"}).
and although i have already set up my entity Classes with cascade persist in Fournitures and also persisted in my newAction, the problem still persists.
/**
* #var \AppBundle\Entity\Classes
*
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Classes", cascade={"persist"})
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="idclasses", referencedColumnName="idclasses", nullable=false)
* })
*/
private $idclasses;
NewAction
if ($form->isSubmitted() && $form->isValid()) {
$em->persist($client);
$em->persist($client->getIdfournitures());
$em->persist($client->getIdfournitures()->getIdclasses());
$em->flush();
}
I do not know if what I'm doing this with symfony or not, but I need help to solve the problem because I do not know what to do, thank you!

Answer 1

Add cascade persist to your oneToMany relation too.