php - why it gives null to author_id in the same insert it is fetched by AuthorSubscriber

I am new tosymfony4, I have two tablesuser andcomment and how between them aManyToOne relation, it means there isauthor_id incomment table, I created a SubscriberAuthorSubscriber.php to get user id calledauthor_id to insertauthor_id automatically when persisting acomment, but when I use postman and execute queryhttp://127.0.0.1:8000/api/comments it is persistcomment but it gives null to author_id.

data postman

    {
        "content": "my new content for postman",
        "published": "2021-01-09T16:40:21+00:00",
        "post": "/api/posts/728"
    }
**AuthorSubscriber.php**
<?php

namespace App\EventSubscriber;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
use ApiPlatform\Core\EventListener\EventPriorities;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\HttpFoundation\Request;
use App\Entity\Post;

class AuthorSubscriber implements EventSubscriberInterface
{
    public $myToken;
    public function __construct(TokenStorageInterface $myToken)
    {
        $this->myToken = $myToken;
    }

    public function getUserFromToken(GetResponseForControllerResultEvent $event)
    {
        $entity = $event->getControllerResult();
        $method = $event->getRequest()->getMethod();

        if(($entity instanceof Post || $entity instanceof Comment) && $method == Request::METHOD_POST) {
            
            $author = $this->myToken->getToken()->getUser();
            $entity->setAuthor($author);
        }
    }

    public static function getSubscribedEvents()
    {
        return [
           'kernel.view' => ['getUserFromToken', EventPriorities::PRE_WRITE],
        ];
    }
}
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