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移出。

Python/Django n00b moving over from javascript.

尝试使用Django REST Framework添加API端点，我希望最终能够更新用户带有PATCH请求的正文，但现在我只希望它不引发500错误。

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.

我已将其添加到urlpatterns中：

I've added this to urlpatterns:

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

这应该带来以下观点：

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看起来像这个：

The UserSerializer looks like this:

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

每次访问时似乎都会得到此信息路线：

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

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

我不知道自己在做什么-有人见过吗？

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

更新：完全追溯：

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

推荐答案

您在 DEFAULT_PERMISSION_CLASSES 值中键入了逗号，因为Django将其作为字符串而不是元组。

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

解决方案：

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

这篇关于Django REST框架：“ BasePermissionMetaclass”对象不可迭代的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！