ArticleSubscriber.php

<?php
declare(strict_types=1);
namespace App\EventSubscriber;

use ApiPlatform\Core\EventListener\EventPriorities;
use App\Entity\Article;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * @author Danielle Suurlant <danielle.suurlant@gmail.com>
 */
class ArticleSubscriber extends AuthenticatedSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::REQUEST => ['setUserForArticle', EventPriorities::POST_DESERIALIZE],
        ];
    }

    public function setUserForArticle(GetResponseEvent $event)
    {
        $this->setUser($event, Article::class);
    }

}