Question

我有以下型号：

models.py

class Invoice(models.Model):
    # invoice fields

class LineItem(models.Model):
    invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE, related_name='lineitems')
    code = models.ForeignKey(Code, on_delete=models.CASCADE, related_name='lineitems')
    # other fields

我相信我应该能够通过invoice.lineitems.all()访问发票的相关对象，并通过code.lineitems.all()访问代码，其中invoice和code是模型类的实例。< / p>

但是，如果我这样做：

x = Invoice.objects.last()
x.lineitems.all()

我收到以下错误：

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "../.venv/lib/python2.7/site-packages/django/db/models/fields/related.py", line 816, in __get__
    return self.related_manager_cls(instance)
  File "../.venv/lib/python2.7/site-packages/django/db/models/fields/related.py", line 683, in __init__
    super(RelatedManager, self).__init__()
TypeError: __init__() takes exactly 2 arguments (1 given)

我是否错误地访问了这个？也许某个地方有名字冲突？

`related_names`不可用作反向关系

0 个答案: