Django数据库:如何根据其他对象的字段筛选对象?

在下面的代码中,如何过滤 capital_listings 那么,只为首都城市返回上市?还有,有没有可能去掉中间产物 capitals_names 名单?

capitals = City.objects.filter(status='capital')
capitals_names = [capital.name for capital in capitals]
capital_listings = Listing.objects.filter #???

模型:

class Listing(models.Model):
    city = models.CharField(max_length = 30, default = 'placeholder')
    date_added = models.DateTimeField()

    def __str__(self):
        return self.name

class City(models.Model):
    name = models.CharField(max_length = 30, default = 'placeholder')
    status = models.CharField(max_length = 30, default = 'placeholder')

    def __str__(self):
        return self.name