python - NoMigrations exception for django.contrib.x has no migrations

Question

I am trying to migrate a model that has nothing to do with this and as soon as I do migrate it gives me this error:

NoMigrations: Application '<module 'django.contrib.comments' from C:\Python27\lib\site-packages\django\contrib\comments\__init__.pyc' has no migrations.

I have tried deleting migrations folder and deleting databases but keeps coming up.

Answer 1

在这种情况下，可能是您有另一个应用程序被命名为模块的最后一部分“评论”，或者您在数据库表 south_migrationhistory 中有一个条目，其 app_name 与模块相同。

在这里找到答案Google Groups

Answer 2

我建议如果您可以使用 django dumpdata ，您将获得模型的 json 文件副本。

$ python manage.py dumpdata <app-name> --indent=2

or create a folder to put the result in

$ python manage.py dumpdata <app-name> --indent=2  > [project]/[app]/[folder]/file-name.json

稍后您可以使用数据上传来重建原始模型。