python - 如何解决托管在 heroku 上的 django 项目的迁移问题？

Question

我的项目托管在 heroku 上，最近我想更改一列的大小在数据库中但是在运行 ma​​kemigrations 命令然后运行 ​​migrate 命令后出现错误，我不想丢失我的数据。

   H:\shuboy2014>heroku run python manage.py makemigrations posts
   Running python manage.py makemigrations posts on shuboy2014... up, run.9067
   Migrations for 'posts':
     0003_auto_20160608_1404.py:
       - Alter field slug on post       

   H:\shuboy2014>heroku run python manage.py migrate
   Running python manage.py migrate on shuboy2014... up, run.3731
   Operations to perform:
     Apply all migrations: admin, contenttypes, posts, sessions, auth
   Running migrations:
     No migrations to apply.
     Your models have changes that are not yet reflected in a migration, and so won't be applied.
     Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.

任何有用的建议都将不胜感激。

Answer 1

heroku run 命令在具有临时文件系统的一次性 Dynos 上运行，因此您在立即销毁的文件系统上生成迁移文件。

您应该在本地生成迁移，提交并推送它们，然后执行 heroku run python manage.py migrate 命令。