Django REST 框架:“BasePermissionMetaclass"对象不可迭代 [英] Django REST Framework: 'BasePermissionMetaclass' object is not iterable

问题描述

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 PATCH 请求的正文更新用户，但现在我只希望它不会抛出 500 错误.

我已将此添加到 urlpatterns:

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

这应该会带来这个观点:

from django.contrib.auth.models 导入用户从 rest_framework.generics 导入 UpdateAPIView从 .serializers 导入 UserSerializer类 UpdateView(UpdateAPIView):查询集 = User.objects.all()serializer_class = UserSerializer

UserSerializer 看起来像这样:

class UserSerializer(serializers.ModelSerializer):元类:模型 = 用户字段 = ('用户名', 'pk', '状态')

每次我访问路线时似乎都会得到这个:

TypeError at/api/update/BasePermissionMetaclass"对象不可迭代

我不知道我在做什么 - 以前有人见过这个吗?

更新:完整追溯:

内部服务器错误:/api/update/回溯(最近一次调用最后一次):文件path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/exception.py"，第 41 行，在内部响应 = 获取响应(请求)文件path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/base.py"，第 187 行，在 _get_responseresponse = self.process_exception_by_middleware(e, request)文件path/to/myapp/env/lib/python2.7/site-packages/django/core/handlers/base.py"，第 185 行，在 _get_response响应=wrapped_callback(请求，*callback_args，**callback_kwargs)文件path/to/myapp/env/lib/python2.7/site-packages/django/views/decorators/csrf.py"，第58行，在wrapped_view返回 view_func(*args, **kwargs)文件path/to/myapp/env/lib/python2.7/site-packages/django/views/generic/base.py"，第68行，查看返回 self.dispatch(request, *args, **kwargs)文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 495 行，在调度中响应 = self.handle_exception(exc)文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 455 行，在 handle_exceptionself.raise_uncaught_exception(exc)文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 483 行，在调度中self.initial(请求，*args，**kwargs)文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 401 行，初始self.check_permissions(请求)check_permissions 中的文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 333 行在 self.get_permissions() 中获得许可:文件path/to/myapp/env/lib/python2.7/site-packages/rest_framework/views.py"，第 280 行，在 get_permissions返回 [permission() 在 self.permission_classes 中获得许可]类型错误:BasePermissionMetaclass"对象不可迭代

解决方案

您在 DEFAULT_PERMISSION_CLASSES 值中输入了错误的逗号，因此 Django 将其视为字符串，而不是元组.

解决方案:

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

Python/Django n00b moving over from javascript.

Trying to add an API endpoint using Django REST Framework which I'm hoping will ultimately be able to update a User with the body of a PATCH request, but for now I just want it to not throw a 500 error.

I've added this to urlpatterns:

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

And that should bring in this view:

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

The UserSerializer looks like this:

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

Seem to be getting this every time I visit the route:

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

I have no idea what I'm doing - anyone seen this before?

UPDATE: Full Traceback:

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

解决方案

You have mistyped the comma in DEFAULT_PERMISSION_CLASSES value, due to which Django takes it as a string, instead of a tuple.

Solution:

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

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