Django. Cannot resolve keyword 'user_name' into field?

Всем привет! Как правильно сделать вывод объявлений только текущего пользователя?

def dashboard(request):
  listings = Listing.objects.order_by('-list_date').filter(user_name=request.user)

  paginator = Paginator(listings, 6)
  page = request.GET.get('page')
  paged_listings = paginator.get_page(page)

  context = {
    'listings': paged_listings
  }
  return render(request, 'accounts/dashboard.html', context)

Модель объявления:

class Listing(models.Model):
	realtor = models.ForeignKey(Realtor, on_delete=models.CASCADE, verbose_name='Риэлтор')
	region = models.CharField(default="Чуйская", max_length=100, verbose_name='Область')
	city = models.CharField(default="Бишкек", max_length=100, verbose_name='Город')
	district = models.CharField(max_length=100, verbose_name='Район')
	title = models.CharField(blank=True, max_length=200, verbose_name='Заголовок')
	address = models.CharField(max_length=200, verbose_name='Адрес')
	description = models.TextField(blank=True, verbose_name='Описание')	
	stage = models.IntegerField(verbose_name='Этаж')
	rooms = models.IntegerField(verbose_name='Количество комнат')	
	garage = models.IntegerField(default=0, verbose_name='Гараж')
	sqmt = models.IntegerField(verbose_name='Площадь')
	price = models.IntegerField(verbose_name='Цена')
	photo_main = models.ImageField(blank=True, upload_to='photos/%Y/%m/%d/', verbose_name='Основное фото')
	photo_1 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 1')
	photo_2 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 2')
	photo_3 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 3')
	photo_4 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 4')
	photo_5 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 5')
	photo_6 = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, verbose_name='Фото 6')
	is_published = models.BooleanField(default=True, verbose_name='Публично')
	list_date = models.DateTimeField(default=datetime.now, blank=True, verbose_name='Дата публикации')

	def __str__(self):
		return self.title

	class Meta:
		verbose_name = 'Объявление'
		verbose_name_plural = 'Объявления'

Модель пользователя, расширенного риэлтором:

class Realtor(models.Model):
	user_name = models.OneToOneField(User, on_delete=models.CASCADE, verbose_name='Пользователь', related_name='user_name')
	full_name = models.CharField(max_length=50, verbose_name='Имя')
	photo = models.ImageField(upload_to='photos/%Y/%m/%d/', verbose_name='Фото')
	description = models.TextField(blank=True, verbose_name='Описание')
	phone = models.CharField(max_length=20, verbose_name='Телефон')
	email = models.CharField(max_length=50, verbose_name='Email')
	is_mvp = models.BooleanField(default=False, verbose_name='Реэлтор месяца')
	hire_date = models.DateTimeField(default=datetime.now, blank=True, verbose_name='Дата приёма на работу')

	def __str__(self):
		return self.full_name

	class Meta:
		verbose_name = 'Риэлтор'
		verbose_name_plural = 'Риэлторы'

Заранее спасибо)