django 合并migration 文件

[kagxin]

以一个app名为django app为例，合并多次makemigrations生成的多个文件

• 查看当前app中有几个migration 文件

  $python manage.py showmigrations
  app
  [X] 0001_initial
  [X] 0002_remove_scloradevice_device_positional

  • 将已经migrate的app的migration文件unapplay

    
    $python manage.py migrate --fake app zero
    Operations to perform:
    Unapply all migrations: app
    Running migrations:
    Rendering model states... DONE
    Unapplying app.0002_remove_scloradevice_device_positional... FAKED
    Unapplying app.0001_initial... FAKED

$python manage.py showmigrations app [ ] 0001_initial [ ] 0002_remove_scloradevice_device_positional

* 到对应app的migations目录下手动删除migration文件

python manage.py showmigrations

app (no migrations)

* 重新生成migration文件
```bash
$python manage.py makemigrations
Migrations for 'app':
  app\migrations\0001_initial.py
    - Create model ****
    - Add field *** to ***

$python manage.py showmigrations
app
 [ ] 0001_initial

重新生成了migration文件，这个文件未apply *使用fake，应用 migrations文件但不修改数据库

$python manage.py migrate app --fake
Operations to perform:
  Apply all migrations: app
Running migrations:
  Applying app.0001_initial... FAKED

$python manage.py showmigrations
app
 [X] 0001_initial

• 这样就将多个migration文件合并了 这个过程中，可以查看一下数据库中django_migrations这张表的变化，他记录了migrations文件是否被apply