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在 Django 中应用迁移时反向返回 Postgres 字段类型

[英]Reverse back Postgres field type when migrations were applied in Django

原文 2019-09-20 22:08:44 7 1 python/ django

I pulled the new code from GitHub and my colleagues changed the type of a field in a Django model from TextField to JSONField .我从 GitHub 中提取了新代码，我的同事将Django model 中的字段类型从TextField更改为JSONField 。 After running python manage.py makemigrations and python manage.py migrate the type of the field was changed in the database (I suppose).运行python manage.py makemigrations和python manage.py migrate后，数据库中字段的类型发生了变化（我想）。 I needed to reverse back to previous migration and somehow the type of the field was not reversed .我需要退回到以前的迁移，并且不知何故该字段的类型没有反转。 How could I fix the issue?我该如何解决这个问题？ Why reversing back migration does not revert back the field type?为什么撤消迁移不会还原字段类型？

1 个解决方案

Change the field type back to a TextField, then run python manage.py makemigrations and python manage.py migrate again.将字段类型改回 TextField，然后再次运行python manage.py makemigrations和python manage.py migrate 。 If the migration still exists in your django project, it will look at its dependencies , which most likely still links to the migration that turned it into a JSONField.如果您的 django 项目中仍然存在迁移，它将查看其dependencies项，这很可能仍链接到将其转换为 JSONField 的迁移。 So simply doing the exact same thing to turn it back into a TextField should work所以简单地做同样的事情把它变成一个 TextField 应该可以

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