在 Django 中添加新的自定义权限

Question

我在 Django 模型中使用自定义权限，如下所示：

class T21Turma(models.Model):
    class Meta:
        permissions = (("can_view_boletim", "Can view boletim"),
                       ("can_view_mensalidades", "Can view mensalidades"),)

问题是，当我向列表添加权限时，它不会添加到 auth_permission 当我运行syncdb时的表。我究竟做错了什么。如果有什么区别的话，我将使用南部进行数据库迁移。

Answer 1

南方不跟踪django.contrib.auth权限。请参阅票＃211 获得更多的信息。

其中关于票的评论表明，使用上执行syncdb的--all选项可以解决该问题。

Answer 2

如果你想“manage.py迁移”尽一切（不调用执行syncdb --all）。您需要创建一个新的迁移权限：

user@host> manage.py datamigration myapp add_perm_foo --freeze=contenttypes --freeze=auth

编辑创建的文件：

class Migration(DataMigration):

    def forwards(self, orm):
        "Write your forwards methods here."
        ct, created = orm['contenttypes.ContentType'].objects.get_or_create(
            model='mymodel', app_label='myapp') # model must be lowercase!
        perm, created = orm['auth.permission'].objects.get_or_create(
            content_type=ct, codename='mymodel_foo', defaults=dict(name=u'Verbose Name'))

Answer 3

这为我工作：

./manage.py update_permissions

这是一个 django的的扩展事情。

Answer 4

您可以连接到 post_migrate 信号以便在迁移后更新权限。我使用以下代码，稍加修改 充满激情的开发 和最初来自 Django 扩展.

# Add to your project-level __init__.py

from south.signals import post_migrate

def update_permissions_after_migration(app,**kwargs):
    """
    Update app permission just after every migration.
    This is based on app django_extensions update_permissions management command.
    """
    from django.conf import settings
    from django.db.models import get_app, get_models
    from django.contrib.auth.management import create_permissions

    create_permissions(get_app(app), get_models(), 2 if settings.DEBUG else 0)

post_migrate.connect(update_permissions_after_migration)

Answer 5

当我捉迷藏迁移用下面的代码

ct, created = orm['contenttypes.ContentType'].objects.get_or_create(model='mymodel',     app_label='myapp') # model must bei lowercase!
perm, created = orm['auth.permission'].objects.get_or_create(content_type=ct, codename='mymodel_foo')

我得到下面的错误

File "C:\Python26\lib\site-packages\south-0.7.3-py2.6.egg\south\orm.py", line 170, in  __getitem__
raise KeyError("The model '%s' from the app '%s' is not available in this migration." % (model, app))
KeyError: "The model 'contenttype' from the app 'contenttypes' is not available in this migration."

要防止这种错误，我修改了代码

from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import Permission

class Migration(DataMigration):

    def forwards(self, orm):
        "Write your forwards methods here."
        ct = ContentType.objects.get(model='mymodel', app_label='myapp') 
        perm, created = Permission.objects.get_or_create(content_type=ct, codename='mymodel_foo')
        if created:
            perm.name=u'my permission description'
            perm.save()