Django跨越关系

Question

我已阅读文档,但仍然出现错误.我有用户为目录对象下订单.我想创建一个查询,该查询返回具有包含特定目录项的订单的所有用户.

这是我的模特:

class Catalog(models.Model):
  name = models.CharField(max_length=100)
  price = models.IntegerField()

  def __unicode__(self):
      return self.name

class Annual(models.Model):
  catalog = models.OneToOneField(Catalog, blank=True, null=True, related_name='annual_products')
  year_id = models.IntegerField(max_length=4)
  start_date = models.CharField(max_length=10)
  end_date = models.CharField(max_length=10)
  date = models.DateTimeField(auto_now_add=True, blank=True)
  def __unicode__(self):
      return unicode(self.year_id)

class Order(models.Model):
  user = models.ForeignKey(User, related_name='who_ordered')
  select = models.ManyToManyField(Catalog, related_name='annuals_ordered', blank=True, null=True)

  def __unicode__(self):
      return unicode(self.user)

这是我一直在尝试的查询:

 Catalog.objects.filter(order__select__annual='2014')

Answer 1

如果您需要用户,则应从用户开始.此外,您需要过滤年度中的特定字段,即year_id.

User.objects.filter(order__select__annual__year_id=2014)