django 迁移表时Running migrations: No migrations to apply.

我遇到的问题是：

Operations to perform:
  Apply all migrations: admin, areas, auth, contents, contenttypes, goods,
 orders, sessions, users
Running migrations:
  No migrations to apply.

解决：
在数据库中：DELETE FROM django_migrations WHERE app='orders'
重新迁移生成表就好了