Can't bind form data to doctrine find function. "ORMInvalidArgumentException" - php

Question

I'm trying to make a simple guestbook in Symfony 4, my goal is that you can add a message to the guestbook but before that, it needs to be internally activated.
I'm now working on the activating site, but there is a problem I can't really fix. The error message is as follows:
Binding entities to query parameters only allowed for entities that
have an identifier.
What i'm trying to do is, after you've typed in the ID of the non-activated message in the Activator Form, it takes the data (ID) from the form that was given and Doctrine finds the specific row of that ID. Then, it changes the rows smallint (not boolean) "isActive" to 1, so the Guestbook know which messages to show.
At " $message = $repository->find($id); " symfony couldn't bind my form data with the query parameters. I've already tried this answer but it didn't work either.
GBActivatorController.php:
use App\Entity\Guestbook;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\NumberType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
class GBActivatorController extends AbstractController
{
public function index(Request $request)
{
//sets up the entity guestbook and the entitymanager from doctrine
$guestbook = new Guestbook();
$entityManager = $this->getDoctrine()->getManager();
//get all messages
$list = $this->getDoctrine()
->getRepository(Guestbook::class)
->findAll();
//create form for activating a non-activated message
$activator = $this->createFormBuilder($guestbook)
->add('id', NumberType::class,
array(
'mapped' => false,
))
->add('activate', SubmitType::class, ['label' => 'Activate'])
->getForm();
$activator->handleRequest($request);
/*when the submit button is clicked, get the data and
find the row with the specific id that was given.*/
if($activator->isSubmitted())
{
//gets the data from the form
$id = $activator->getData();
//sets up repository, so i dont need to type it again
$repository = $this->getDoctrine()->getRepository(Guestbook::class);
//(should) find the row
$message = $repository->find($id);
//activates row. (isActive = 1 instead of isActive = 0)
$message->setIsActive(1);
//persist and then execute to table
$entityManager->persist($message);
$entityManager->flush();
}
//renders the template
return $this->render('GBActivator.html.twig', array(
'list' => $list,
'activator' => $activator->createView()
));
}
}
Entity/Guestbook.php:
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\GuestbookRepository")
*/
class Guestbook
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
public $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $email;
/**
* #ORM\Column(type="string", length=255)
*/
private $text;
/**
* #ORM\Column(type="smallint")
*/
private $isActive;
public function setId(Array $id)
{
$this->id = $id;
}
public function getId(): ?int
{
return $this->id;
}
public function getEmail(): ?string
{
return $this->email;
}
public function setEmail(string $email): self
{
$this->email = $email;
return $this;
}
public function getText(): ?string
{
return $this->text;
}
public function setText(string $text): self
{
$this->text = $text;
return $this;
}
public function getIsActive(): ?int
{
return $this->isActive;
}
public function setIsActive(int $isActive): self
{
$this->isActive = $isActive;
return $this;
}
}

Answer 1

Thank you Eakethet.
My problem was that i demanded an array instead of a string. Stupid me. I changed
public function setId(Array $id)
{
$this->id = $id;
}
to
public function setId(string $id)
{
$this->id = $id;
}