添加组权限时出现django-guardian DoesNotExist错误

Question

我想为我的django应用程序添加每个对象的权限，但我似乎无法实现基本功能。我也在使用python社交身份验证，但我不认为这会成为身份验证的问题。用户仍然正常工作。

我似乎做得很正确，但当我尝试向组添加权限时，它失败了，并出现DoesNotExist错误。

为了稍微解释一下我的设计，每个项目都有一个领导者和一组成员。成员组定义项目的每个成员将拥有的权限。领导在成员组中，但最终也会添加特殊权限，允许他们做标准成员不能做的事情。

我的型号.py

class Project(models.Model):
    # Leader of the project
    project_name = models.CharField(max_length=200, unique=True)
    # The url for the stash repository 
    #project_repo = models.
    # Date the project was created
    date_created = models.DateTimeField(auto_now=True)
    # Person in charge of the project
    project_lead = models.ForeignKey(User, related_name='%(class)s_lead_set')
    # Group of members to use for permission checking
    members = models.ForeignKey(Group, null=True, default=None)
    class Meta: 
        permissions = (
            ('edit_project', 'Edit Project'),
        )

我的观点.py

@login_required
def create(request): 
    if request.method== "POST": 
        form = NewProjectForm(request.POST)
        if form.is_valid(): 
            # Create the new project
            project = Project(**form.cleaned_data)
            project.project_lead = request.user
            # Create a user group
            members = Group.objects.create(name = project.project_name)
            members.save()
            # Add the members group to the project
            project.members = members
            project.save()
            #ERROR OCCURS HERE
            assign_perm('edit', members, project)
            members.save()

从我的项目设置.py

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'thelibrary',
    'home',
    'projects',
    'social.apps.django_app.default',
    'guardian',
)
TEMPLATE_CONTEXT_PROCESSORS = (
   'django.contrib.auth.context_processors.auth',
   'django.core.context_processors.debug',
   'django.core.context_processors.i18n',
   'django.core.context_processors.media',
   'django.core.context_processors.static',
   'django.core.context_processors.tz',
   'django.contrib.messages.context_processors.messages',
   'social.apps.django_app.context_processors.backends',
   'social.apps.django_app.context_processors.login_redirect',
)
AUTHENTICATION_BACKENDS = (
   'social.backends.google.GoogleOAuth2',
   'guardian.backends.ObjectPermissionBackend',
   'django.contrib.auth.backends.ModelBackend',
)

全堆栈跟踪

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/guardian/shortcuts.py", line 91, in assign_perm
return model.objects.assign_perm(perm, user, obj)
  File "/usr/lib/python2.7/site-packages/guardian/managers.py", line 33, in assign_perm
permission = Permission.objects.get(content_type=ctype, codename=perm)
  File "/usr/lib64/python2.7/site-packages/django/db/models/manager.py", line 92, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/django/db/models/query.py", line 357, in get
    self.model._meta.object_name)
DoesNotExist: Permission matching query does not exist.

Answer 1

您应该更改

assign_perm('edit', members, project)

至

assign_perm('edit_project', members, project)