Python Django REST框架：'；BasePermissionMetaclass'；对象是不可编辑的

Python/Django n00b从javascript迁移过来

尝试使用Django REST框架添加API端点，我希望最终能够使用补丁请求的主体更新用户，但现在我只希望它不会抛出500错误

我已将此添加到URL模式：

url(r'update/$', views.UpdateView.as_view(), name="update_user"),

这应该带来这样的观点：

from django.contrib.auth.models import User
from rest_framework.generics import UpdateAPIView
from .serializers import UserSerializer

class UpdateView(UpdateAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer

UserSerializer如下所示：

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('username', 'pk', 'status')

似乎每次我参观路线时都会看到：

TypeError at /api/update/
'BasePermissionMetaclass' object is not iterable

我不知道我在做什么-以前有人见过吗

更新：完全回溯：

Internal Server Error: /api/update/
Traceback (most recent call last):
  File "path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "path/to/myapp/env/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "path/to/myapp/env/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 495, in dispatch
    response = self.handle_exception(exc)
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 455, in handle_exception
    self.raise_uncaught_exception(exc)
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 483, in dispatch
    self.initial(request, *args, **kwargs)
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 401, in initial
    self.check_permissions(request)
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 333, in check_permissions
    for permission in self.get_permissions():
  File "path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py", line 280, in get_permissions
    return [permission() for permission in self.permission_classes]
TypeError: 'BasePermissionMetaclass' object is not iterable

---

您在

DEFAULT\u PERMISSION\u CLASSES

值中输入了错误的逗号，因此Django将其作为字符串而不是元组

解决方案：

REST_FRAMEWORK = {
   ...
   'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.IsAdminUser', ),
   ...
}

---

我也有同样的问题，但找错了地方。我用权限创建了mixin类，并且有代码

permission_classes = (
    permissions.IsAuthenticated
)

但应该是

permission_classes = (
    permissions.IsAuthenticated,
#                              ^
#                         a comma here
)

---

因此，不要忘记查找具有权限的其他类。我希望它能帮助一些人。

作为其他可能在这里搜索的人的参考，这可能也是一个问题

from django.contrib.auth.models import User
from rest_framework.generics import UpdateAPIView
from .serializers import UserSerializer

class UpdateView(UpdateAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    permission_classes = IsAuthenticated

应改为：

    from django.contrib.auth.models import User
    from rest_framework.generics import UpdateAPIView
    from .serializers import UserSerializer

    class UpdateView(UpdateAPIView):
        queryset = User.objects.all()
        serializer_class = UserSerializer
        permission_classes = [IsAuthenticated]

---

万一遇到麻烦也可以解决。至少解决了我的问题。

显示完整的回溯。很可能是您定义了权限（针对类或通过设置），但没有将其添加为列表显示

权限\u类

从设置模块配置。@SachinKukreja-您的意思是？~~~~REST\u FRAMEWORK={'DEFAULT\u AUTHENTICATION\u CLASSES'：（'REST\u FRAMEWORK.AUTHENTICATION.TokenAuthentication'，），'DEFAULT\u PERMISSION\u CLASSES'：（'REST\u FRAMEWORK.permissions.isadmin'），}~~~~哇-就是这样！非常感谢你-已经在这上面停留了几天了-这是一个如此简单的解决方案！对于想知道更改是什么的人，您必须在权限后添加逗号。IsAuthenticated..我花了几分钟才弄明白：）idk为什么我花了15分钟才意识到此评论的存在。。。