在Django（1.8）应用程序之间移动模型与ForeignKey引用 [英] Move models between Django (1.8) apps with ForeignKey references

问题描述

我基本上有同样的问题移动Django（1.8）应用程序与所需的ForeignKey引用之间的模型。 @halfnibble
的响应似乎是有效的，但在我的情况下，有一个ForeignKey从new_app指向old_app。
为了简单起见，我将把我的名字翻译成@halfnibble的名字，轮胎将有一个ForeignKey to Car。

迁移运行正常。
稍后迁移我将old_app.Car重命名为old_app.NewCar（我不知道这是否影响）。
但有些迁移后，当我尝试删除new_app.Tires，并在下一次迁移old_app.NewCar我得到错误：

 > python manage.py migrate 
 .... 
 ValueError：模型的未处理的挂起操作：
 old_app.newcar（由字段：new_app.Tires.car引用）
  

如果我运行我的应用程序测试，它们正常运行，我也检查了生成的MySQL查询，似乎是正确的。 p>

解决方案

我发现错误，我留下这些信息，以防任何人都有同样的问题。

这个问题真的是由old_app.Car重命名为old_app.NewCar引起的。

makemigrations检测到更改，并在old_app中创建了两个迁移重命名等new_app更新ForeingKey。问题是您必须手动添加new_app依赖关系old_app迁移模型重命名。

I basically have the same question Move models between Django (1.8) apps with required ForeignKey references. The response from @halfnibble seems valid but in my case there is a ForeignKey pointing from new_app to old_app. I wil translate my names to names on @halfnibble example for simplicity, Tires will have a ForeignKey to Car.

The migrations runs fine. Few migrations later I rename old_app.Car to old_app.NewCar (I don't know if this affects). But some migrations later when I try to delete new_app.Tires and in next migration old_app.NewCar I get the error:

>python manage.py migrate
  ....
ValueError: Unhandled pending operations for models:
  old_app.newcar (referred to by fields: new_app.Tires.car)

If I run my apps tests they run correctly, I have also inspected generated MySQL queries and seems correct.

解决方案

I found the error, I left this information in case anybody has the same problem.

The problem was really induced by the rename of old_app.Car to old_app.NewCar.

makemigrations detected the change and created two migrations one in old_app with the rename and other on new_app updating the ForeingKey. The problem was that you have to manually add in new_app dependencies the old_app migration where the model was renamed.

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