使用Django模型权限会引发DoesNotExist错误

时间:2013-10-09 16:25:35

标签: python django django-models permissions django-guardian

我对django监护人有些问题。我有一个新闻模型定义

class News(models.Model):
    title = models.CharField(_('Title'), max_length=255)
    slug = models.SlugField(_('Slug'), unique_for_date='pub_date',)

    objects = models.Manager()
    featured = FeaturedNewsManager()

    link = models.URLField(_('Link'), blank=True, null=True,)

    class Meta:
        permissions = (('view_news', _('view news')))

然后我尝试将view_news权限分配给我的一个用户,我收到以下错误:

>>> from guardian.shortcuts import assign_perm
>>> g = Group.objects.latest('pk')
>>> n = News.objects.get(pk=4)
>>> assign_perm( 'news.view_news', g, n)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/home/roberto/.virtualenvs/ve_news/local/lib/python2.7/site-packages/guardian/shortcuts.py", line 93, in assign_perm
    return model.objects.assign_perm(perm, group, obj)
  File "/home/roberto/.virtualenvs/ve_news/local/lib/python2.7/site-packages/guardian/managers.py", line 90, in assign_perm
    permission = Permission.objects.get(content_type=ctype, codename=perm)
  File "/home/roberto/.virtualenvs/ve_news/local/lib/python2.7/site-packages/django/db/models/manager.py", line 143, in get
    return self.get_query_set().get(*args, **kwargs)
  File "/home/roberto/.virtualenvs/ve_news/local/lib/python2.7/site-packages/django/db/models/query.py", line 404, in get
    self.model._meta.object_name)
DoesNotExist: Permission matching query does not exist.

我尝试迁移我的应用,但这似乎无法解决我的问题。有什么帮助吗?

谢谢!

2 个答案:

答案 0 :(得分:5)

尝试做:

python manage.py syncdb --all 

或进行自己的迁移以处理新权限(南方存在一个错误,阻止自动创建迁移以获得监护人权限)

答案 1 :(得分:1)

我相信syncdb不是这里的诀窍。我想当你向列表中添加更多权限时,你的代码就开始工作了。

此行存在错误:

permissions = (('view_news', _('view news')))

应该是:

permissions = (('view_news', _('view news')),)

请注意缺少的逗号。权限是一对元组的元组(权限代码权限描述

修改

我曾陷入同一陷阱。避免它的最佳方法是使用一个权限组织代码如下:

permissions = (
    ('view_news', _('view news')),
)

之后记得按照@Foo Party和@sogeking

的提法做一个syncdb
$ python manage.py syncdb