Using Data Transfer Objects

In case you are using data transfer objects instead of binding your entities directly, you'll have to add all required information to your data object. In case of a EditUserType, this could be a EditUserData. In order to get the Account entity into the handler, you can create the data object with an Account as required value. The data object would probably look similar to this:

<?php
namespace App\FormData;

use App\Entity\Account;

final class EditUserData
{
    private $account;
    private $first_name;

    // ...
    // other field for the form

    public function __construct(Account $account)
    {
        $this->account = $account;

        // default form values
        $this->first_name = $account->getFirstName();
        // ...
    }

    public function getAccount(): Account
    {
        return $this->account;
    }

    // ...
    // other getters and setters for the form
}

The controller needs a small change for this. Instead of setting the Account as data object, you have to create the EditUserData.

<?php
namespace App\Controller;

use App\Entity\Account;
use App\FormData\EditUserData;
use App\FormHandler\EditUserFormHandler;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class EditUserController extends Controller
{
    /**
     * @Route("/edit-user/{id}/", name="app.edit-user")
     */
    public function editUserAction(Request $request, Account $account)
    {
        $handler = $this->get('hostnet.form_handler.factory')->create(EditUserFormHandler::class);
        $data    = new EditUserData($account);

        if (($response = $handler->handle($request, $data)) instanceof RedirectResponse) {
            return $response;
        }

        return $this->renderView('edit_user.html.twig', ['form' => $handler->getForm()->createView());
    }
}

When handling this data in your onSuccess callback, you can now transfer the data from your data transfer object, into the entity.