django - add() 为 ManyToManyField 指定一个中间模型

Question

关于这个Exception有很多问题:

AttributeError: Cannot set values on a ManyToManyField which specifies 
an intermediary model.
Use myapp.MyThroughModel's Manager instead.

docs

You can’t just create a relationship between a Person and a Group - you need to specify all the detail for the relationship required by the Membership model. The simple add, create and assignment calls don’t provide a way to specify this extra detail. As a result, they are disabled for many-to-many relationships that use an intermediate model.

但是我所有的 MyThroughModel 属性/列都是可选的。经理可以创建它们。

如何编写自定义管理器来自动创建 MyThroughModel 实例？

我需要 ORM 级别的解决方案，而不是表单级别的解决方案。

Answer 1

我找到了一种告诉 django 忽略额外数据的方法:

class MyThroughModel(Model):
    class Meta():
        auto_created=True
    ...

更新

这会导致 django 内部迁移出现问题。我们更新了我们的代码并且不使用 auto_created = True没有了。