如何将django-mptt重建添加到迁移中?

问题描述

我已将django-mptt添加到现有数据库中，并创建了新的迁移.

I have add the django-mptt to existing database, and create the new migration.

要求迁移过程提供level，left，right等字段的默认值，但不会将model.rebuild操作添加到迁移文件中.

Migration process was asked for default values for level, left, right and such fields, but doesn't add the model.rebuild operation to migration file.

如何在迁移文件中手动添加重建操作?

How to add rebuild operation to migration file manually?

推荐答案

尝试以下操作:

from __future__ import unicode_literals
from django.db import migrations
from mptt import register, managers


def rebuild_tree(apps, schema_editor):
    YourMPTTModel = apps.get_model('your_app', 'YourMPTTModel')

    manager = managers.TreeManager()
    manager.model = YourMPTTModel

    register(YourMPTTModel)

    manager.contribute_to_class(YourMPTTModel, 'objects')
    manager.rebuild()


class Migration(migrations.Migration):


  operations = [
      migrations.RunPython(
          rebuild_tree
      )
  ]

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