Question

我的项目托管在heroku上，最近我想改变一列的大小在db 但是在运行 makemigrations 命令然后迁移命令后，它会出错并且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.

任何有用的建议都会很明显。

Answer 1

heroku run命令在具有临时文件系统的One-Off Dynos上运行，因此您将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，提交和推送它们，然后执行heroku run python manage.py migrate命令。

Answer 2

我只是在本地计算机上运行 makemigrations 和迁移命令，然后在heroku上将其推送并再次运行这两个命令并完成。

 H:\shuboy2014>heroku run python manage.py migrate
 Running python manage.py migrate on shuboy2014... up, run.6192
 Operations to perform:
   Apply all migrations: contenttypes, auth, posts, sessions, admin
 Running migrations:
   Rendering model states... DONE
   Applying posts.0003_auto_20160608_2001... OK

如何在heroku上托管的django项目中解决迁移问题？

2 个答案: