将Django模型从一个应用程序移动到另一个应用程序 [英] Move Django model from one app to another
问题描述
我在同一个Django应用程序中造成了太多的模型的愚蠢错误，现在我想把它分成3个不同的模型。问题是：在两个客户的网站上已经有数据生产了，所以我需要仔细地规划任何模式/数据迁移来完成（我使用的是django-south）。我不确定如何继续，任何建议将不胜感激。
I made the stupid mistake of creating too many models in the same Django app, now I want to split it into 3 distinct ones. Problem is: there's already data in production in two customers' sites, so I need to carefully plan any schema/data migration to be done (I'm using django-south). I'm unsure on how to proceed, any advice would be greatly appreciated.
（我在Ubuntu服务器上使用PostgreSQL 12.4 LTS，如果这有任何相关性）
(I'm using PostgreSQL on a Ubuntu server 12.4 LTS, if that's of any relevance)
我考虑过使用 db.rename_table ，但无法弄清楚如何正确地将外键更新到这些模型（旧到新） - 与数据库级无关（因为表重命名已经被覆盖了），但在ORM级别不是这样。
I thought about using db.rename_table, but can't figure out how to correctly update the foreign keys to those models (old to new) - irrelevant at the database level (since the table renaming already got that covered), but not so at the ORM level.
更新：在考虑之后，在询问这个问题在programmmers.SE，我决定保持简单，不用担心主要版本的产品之间的迁移。短期来说，我将使用 db.rename_table 匹配新的名称，同时使用 db_table 作为Daniel Roseman建议，所有的同时保持模型在旧的应用程序。当升级到主要版本时，我转向新的应用程序并完全移植所有迁移（因此，新版本的新安装将按原样创建数据库，而不是经历所有历史迁移）。
Update: after thinking about it, and after asking this question on programmmers.SE, I decided to keep things simple and don't worry about migrations between major versions of the product. Short term, I'll just use db.rename_table to match the new name, while also using db_table as Daniel Roseman suggested, all the while keeping the models in the old app. When upgrading to a major version, I swith to the new app and ditch all migrations altogether (so fresh installs of the new version will create the database "as-is" instead of going through all historical migrations).
推荐答案
我不明白为什么你需要任何数据迁移。
I don't see why you need any data migration at all.
新应用的模型，并添加 db_table 在内部Meta类中设置指向旧表名。
Just move the models to the new app, and add a db_table setting in the inner Meta classes to point to the old table names.
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