理解guardian.shortcuts.get_objects_for_user

Question

我很难理解django-守护者函数get_objects_for_user的行为。我正在分配组对象权限，但这些权限似乎不存在于get_objects_for_user。

>>> u = User.objects.get(username='angus')
>>> u.has_perm('news.change_news', n)
True
>>> from guardian.shortcuts import get_objects_for_user
>>> get_objects_for_user(u, (u'news.change_news', ))
[]
>>> get_objects_for_user(u, ('change_news'), klass=News)
[]

不过，这些文档似乎相当清楚：

get_objects_for_user: (user, perms, klass=None, use_groups=True, any_perm=False)
Returns queryset of objects for which a given ``user`` has *all*
permissions present at ``perms``.

我甚至不知道从哪里开始调试。有什么建议吗？

更新：

我的模型定义如下：

class News(models.Model):
    departments = models.ManyToManyField(Department, blank=True, related_name='news', through='NewsDepartmentMembership')
    research_groups = models.ManyToManyField(Group, blank=True, related_name='news', through='NewsGroupMembership')
    people_involved = models.ManyToManyField(Person, blank=True, related_name='news')
    related_news = models.ManyToManyField('News', blank=True)

    title = models.CharField(_('Title'), max_length=255)
    slug = models.SlugField(_('Slug'), unique_for_date='pub_date',)
    excerpt = models.TextField(_('Excerpt'), blank=True)
    content = models.TextField(_('Content'), blank=True)

    is_published = models.BooleanField(_('Published'), default=False)
    pub_date = models.DateTimeField(_('Publication date'), default=datetime.datetime.now)
    is_feat = models.BooleanField(_('Featured'), default=False)

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

Answer 1

这样使用: news = get_objects_for_user(u，('change_news')，klass=News)

编辑:很容易找出问题所在:尝试使用guardian.shortcuts.get_perms (http://pythonhosted.org/django-guardian/api/guardian.shortcuts.html#get-perms)查看用户和对象之间的权限是否真的存在。不久前，我遇到了类似的问题，如果我没记错的话，那么这与用户对超级用户的依赖有关。尝试为用户设置is_superuser false，并查看has_perm是否仍然返回true。

此外，如果可能的话，我建议您不要在项目变得更大时使用get_objects_for_user快捷方式。当您在数据库中获得更多的对象/权限时，它的查询非常缓慢。

艾伦