"detail": "Method \"GET\" not allowed." Django Rest Framework

Question

I know this question maybe a duplicate, but I have tried many solutions and could not understand any. I have followed this tutorial exactly and yet I get this error on the 'userlist' page. Everything else works just fine. Can somebody point out what the error is ?

class UserList(APIView):
"""
Create a new user. It's called 'UserList' because normally we'd have a get
method here too, for retrieving a list of all User objects.
"""

permission_classes = (permissions.AllowAny,)
http_method_names = ['get', 'head']

def post (self, request, format=None):
    self.http_method_names.append("GET")

    serializer = UserSerializerWithToken(data=request.data)
    if serializer.is_valid():
        serializer.save()
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

EDIT: urls.py

from django.urls import include, path
from classroom.views.classroom import current_user, UserList
from .views import classroom, suppliers, teachers
urlpatterns = [path('', classroom.home, name='home'),
               path('current_user/', current_user),
               path('users/', UserList.as_view()),

Edit:

Still getting this error,

Answer 1

You need to add GET endpoint url to your urls.py in order to use GET requests. GET url is missing in your urls.py, simply edit your urls.py like:

# urls.py

from django.urls import include, path
from classroom.views.classroom import current_user, UserList
from .views import classroom, suppliers, teachers

urlpatterns = [
               path('', classroom.home, name='home'),
               path('current_user/', current_user),
               path('users/', UserList.as_view()),
               path('users/<int:pk>/', UserList.as_view()),
              ]

And you need to implement get method in yourUserList view such as:

# views.py

class UserList(APIView):
    """
    Create a new user. It's called 'UserList' because normally we'd have a get
    method here too, for retrieving a list of all User objects.
    """

    permission_classes = (permissions.AllowAny,)
    http_method_names = ['get', 'head']


    def get(self, request, format=None):
        users = User.objects.all()
        serializer = UserSerializerWithToken(users, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        self.http_method_names.append("GET")

        serializer = UserSerializerWithToken(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Answer 2

Basically the problem is that, there is not functionality defined for GET requests in your view. So either you can add it, like this:

class UserList(APIView):
    permission_classes = (permissions.AllowAny,)
    http_method_names = ['get', 'head', 'post']

    def get(self, request, *args, **kwargs):
        serializer = UserSerializerWithToken(User.objects.all(), many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

    def post (self, request, format=None):
        self.http_method_names.append("GET")
        serializer = UserSerializerWithToken(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Or you can subclass UserList View from ListAPIView.

FYI, permission_classes won't work with APIView. You need to use GenericAPIView or any other generic views to have those functionalities.

Answer 3

I had the same issue but I noticed that in my views.py, I had

renderer_class = api_settings.DEFAULT_RENDERER_CLASSES

I corrected it to :

renderer_classes = api_settings.DEFAULT_RENDERER_CLASSES 

and it worked for me.