Django REST Framework: 'BasePermissionMetaclass' object is not iterable
Solution 1
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', ),
...
}
Solution 2
I had the same problem, but looked for wrong place. I made mixin class with permissions and there was code
permission_classes = (
permissions.IsAuthenticated
)
but should be
permission_classes = (
permissions.IsAuthenticated,
# ^
# a comma here
)
So do not forget to look for other classes with permissions. I hope it will help someone.
Solution 3
As a reference for other people who might be searching here, this could be an issue too..
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
Should change to:
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]
Solution 4
@permission_classes((AllowAny,))
You have to ensure the comma
Related videos on Youtube
Jonathan Stevens
Updated on January 14, 2022Comments
-
Jonathan Stevens over 2 years
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
-
Daniel Roseman over 5 yearsShow the full traceback.
-
Linovia over 5 yearsMost likely, you defined a permission (either for the class or through settings) and didn't add it as list
-
Sachin over 5 yearsShow the
PERMISSION_CLASSES
config from settings module. -
Jonathan Stevens over 5 years@SachinKukreja - you mean this? ~~~~ REST_FRAMEWORK = { 'DEFAULT_AUTHENTICATION_CLASSES': ( 'rest_framework.authentication.TokenAuthentication', ), 'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.IsAdminUser' ), } ~~~~
-
-
Jonathan Stevens over 5 yearsWow - that was it! Thank you so much - been stuck on this for a couple of days now - such a simple solution!
-
Matthias over 5 yearsfor anyone wondering what the change is, you have to add a comma after permissions.IsAuthenticated..it took me few minutes to figure out :)
-
iscream about 4 yearsidk why it took me 15mins to realize that this comment even exists...
-
Arunabh Das over 2 yearsAmazing answer!! Thanks!