Adding an object to ManyToMany field doesn't work

I have 2 models:

class User(AbstractUser):
    pass

class Post(models.Model):
    poster = models.ForeignKey('User', on_delete=models.CASCADE, related_name='posts')
    body = models.TextField()
    likes = models.IntegerField(default=0)
    likers = models.ManyToManyField('User', blank=True, null=True, related_name='liked_posts')

Post model has a manytomany field to User model. I try to add a user object to the field with the view function below but it doesn't work.
When I check the post in the admin page, the user is not added to the likers.

@csrf_exempt
def likepost(request, like, post_id):
    if (request.method == 'PUT'):
        post = Post.objects.get(pk=post_id)
        if like:
            post.likers.add(request.user)
        else:
            post.likers.remove(request.user)

        post.save()
        print(post.likers)
        return HttpResponse(status=204)
    else:
        return JsonResponse({
            'error': 'PUT request required.'
        }, status=400)

I make the request in javascript in this way:

fetch(`likepost/${likeValue}/${postId}`, {
        method: 'PUT'
    });

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