On Thu, Feb 13, 2020 at 7:16 PM Bhoopesh sisoudiya <bhoop23...@gmail.com>
wrote:
> Hi all,
>
> How to resolve this exception in generic view of rest-framework- api
> Exception===================
> 2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\
> 14022020.log - ERROR
> ERROR:D:\futuredatapoints\futuredatapoints\logs\14022020.log:
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Exception
> Start %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\
> 14022020.log - ERROR
> 2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\
> 14022020.log - ERROR
> ERROR:D:\futuredatapoints\futuredatapoints\logs\14022020
> .log:Traceback (most recent call last):
> File
> "D:\futuredatapoints\env\lib\site-packages\django\core\handlers\base.py"
> , line 124, in _get_response
> response = wrapped_callback(request, *callback_args, **callback_kwargs)
> File
> "D:\futuredatapoints\env\lib\site-packages\django\views\decorators\csrf.py"
> , line 54, in wrapped_view
> return view_func(*args, **kwargs)
> File
> "D:\futuredatapoints\env\lib\site-packages\django\views\generic\base.py"
> , line 68, in view
> return self.dispatch(request, *args, **kwargs)
> File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py"
> , line 479, in dispatch
> request = self.initialize_request(request, *args, **kwargs)
> File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py"
> , line 380, in initialize_request
> authenticators=self.get_authenticators(),
> File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py"
> , line 274, in get_authenticators
> return [auth() for auth in self.authentication_classes]
> File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py"
> , line 274, in <listcomp>
> return [auth() for auth in self.authentication_classes]
> TypeError: 'list' object is not callable
>
> WARNING:django.request:Bad Request: /api/send/otp/
>
>
> url====== ===========================================================
> url(r'^api/send/data/$',UserViewSetCustom.as_view(),name=
> 'user-view-set-custom'),
>
>
> view generic class ================
> class UserViewSetCustom(generics.CreateAPIView):
> """
> A simple CreateAPIView that for sending otp for user.
> """
> # permission_classes = (AllowAny,)
> authentication_classes = [TokenAuthentication,],
> queryset = User.objects.all()
> def create(self, request):
> print("*******")
> return Response(
> data=jsonResponse([],
> msg=Message.getMessage('NOT_ALLOWED'),
> status=status.HTTP_200_OK),
> status=status.HTTP_200_OK,
> )
>
> Thanks
> Bhoopesh Sisoudiya
>
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> .
>
I did some experimenting in the Python shell. What I found is this:
jlgimeno@jlgimeno-Lenovo-G50-45 ~ python3.8
Python 3.8.1 (default, Dec 31 2019, 11:21:33)
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = [1]
>>> b = [1,]
>>> c = [1,],
>>> a
[1]
>>> b
[1]
>>> c
([1],)
The variables a and b are both lists with a single object, but c is
different. It is a tuple, with the first (and only) element is a list. c
is similar to your authentication_classes variable in your view because of
that trailing comma which makes it a tuple. As you can see in the last two
lines of your traceback, django rest framework is trying to get a list of
authenticators using a list comprehension, by calling each class that is an
element of self.authentication_classes. It's not getting a callable back,
it's getting back a list. Lists are not callables, and so Python raises an
exception.
To fix this, remove the trailing comma in your authentication_classes
variable like so:
authentication_classes = [TokenAuthentication,]
That should work. Hope this helped!
-Jorge
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