Django的。如何为当前用户编写过滤器？

Question

listing应用程序有一个Listing表：

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(blank=True, max_length=100, verbose_name='Район')
    title = models.CharField(max_length=200, verbose_name='Заголовок')
    address = models.CharField(blank=True, max_length=200, verbose_name='Адрес')
    description = models.TextField(blank=True, verbose_name='Описание') 
    stage = models.IntegerField(blank=True, verbose_name='Этажность')
    rooms = models.IntegerField(blank=True, verbose_name='Количество комнат')   
    garage = models.IntegerField(default=0, blank=True, verbose_name='Гараж')
    sqmt = models.IntegerField(blank=True, verbose_name='Площадь')
    price = models.IntegerField(blank=True, verbose_name='Цена')
    photo_main = models.ImageField(upload_to='photos/%Y/%m/%d/', blank=True, 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'

在房地产经纪人应用程序中有一个房地产经纪人模型：

class Realtor(models.Model):
    user_name = models.OneToOneField(User, on_delete=models.CASCADE, verbose_name='Пользователь', related_name='realtor')
    name = models.CharField(max_length=20, 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.name

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

在帐户应用程序中，有一个功能，在个人帐户中应该只显示当前用户在系统中的广告：

    from django.shortcuts import render, redirect
    from django.contrib.auth.models import User
    from listings.models import Listing
    from realtors.models import Realtor

    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
)

如何正确注册此过滤器，以便一切正常，以便显示当前用户的广告：

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

目前，这个错误：

无法将关键字“user_name”解析为字段。选择包括：地址，城市，描述，区，车库，id，is_published，list_date，photo_1，photo_2，photo_3，photo_4，photo_5，photo_6，photo_main，价格，房地产经纪人，realtor_id，地区，房间，sqmt，阶段，标题

谁不难，请帮忙。先感谢您。

Answer 1

由于user_name中没有Listing字段，因此尝试对此进行过滤是错误的。

相反，你可能试图过滤房地产经纪人，这可以用lookup that spans relationships完成：

listings = Listing.objects.order_by('-list_date').filter(realtor__user_name=request.user)

Answer 2

user_name是房地产经纪人模型的一个领域，而非上市。这两个模型通过ForeignKey连接，因此您需要使用双下划线语法遍历该关系。

Listing.objects.order_by('-list_date').filter(realtor__user_name=request.user)

请注意，user_name是该字段的一个非常奇怪的名称;它不是名称，而是User对象本身。它应该被称为user。