Embeed forms - inserting to database - symfony

Question

I created two entities automatically ( using this manual http://symfony.com/doc/2.8/doctrine/reverse_engineering.html) based on ER model generated in Workbench. My intention was to create one-to-one relationship but annotation show it is one-to-many relationship. I created also embeed forms. I would like to insert client and new adress to database. I still get an error:
A new entity was found through the relationship 'UlaBundle\Entity\Client#adres' that was not configured to cascade persist operations for entity: qqq. 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"}).
Error is shown even if i set #ManyToOne(..,cascade={"persist"}) and __toString function. What is the problem? Please help. Below my code:
///Client Entity
class Client
{
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=45, nullable=true)
*/
private $name;
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #var \UlaBundle\Entity\Adres
*
* #ORM\ManyToOne(targetEntity="UlaBundle\Entity\Adres", cascade= {"persist"})
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="adres_id", referencedColumnName="id")
* })
*/
private $adres;
/// Adres Entity
class Adres
{
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=45, nullable=true)
*/
private $name;
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
///Controller
/**
* #Route("/client", name="client")
*/
public function clientAction(Request $request) {
$c = new Client();
$form = $this->createForm(ClientType::class,$c);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$m = $this->getDoctrine()->getManager();
$m->persist($c);
$m->flush();
return new Response('Added');
}
return $this->render('UlaBundle:Default:client_form.html.twig', array('form' => $form->createView()));
}

Answer 1

I think your problem come from the blank space in cascade= {"persist"}, you should remove it
/**
* #var \UlaBundle\Entity\Adres
*
* #ORM\ManyToOne(targetEntity="UlaBundle\Entity\Adres", cascade={"persist"})
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="adres_id", referencedColumnName="id")
* })
*/
private $adres;