Django app getting the error "TypeError: 'dict_keys' object is not subscriptable"

Question

Here is the views:

class UserViewSet(viewsets.ViewSet):
  def list(self, request):
    queryset = User.objects.all()
    serializer = UserSerializer(queryset, many=True)
    return Response(serializer.data)
  
  def retrieve(self, request, pk=None):
    queryset = User.objects.all()
    user = get_object_or_404(queryset, pk=pk)
    serializer = UserSerializer(user)
    return Response(serializer.data)

urls:

from django.urls import path
from .views import *
from rest_framework import routers

userl = UserViewSet.as_view({'get': 'list'})
userd = UserViewSet.as_view({'get': 'retrieve'})

router = routers.SimpleRouter()
router.register(r'users', UserViewSet, basename='user')

urlpatterns = [
  path('users/', userl, name='user-list'),
  path('users/<int:pk>/', userd, name='user-detail'),
  path('register',RegisterUserAPIView.as_view()),
  path('login/', LoginAPIView.as_view()),
  path('logout', LogoutAPIView.as_view()),
  path('products', ProductsViewSet.as_view({'get': 'list'})),

]'login/', LoginAPIView.as_view()),
  path('logout', LogoutAPIView.as_view()),
  path('products', ProductsViewSet.as_view({'get': 'list'})),

]

Traceback:

  File "C:UsersUserDesktoperkin2venvlibsite-packagesroutersrouter.py", line 27, in db_for_read
    return settings.DATABASES.keys()[0]
TypeError: 'dict_keys' object is not subscriptable

I’ve tried using keys() but then it says:

function has no attribute keys().

Asked By: Prims3s

||

Source

Answer 1

Apparently and perhaps counter-intuitively, the keys() method for dictionaries does not return a list of keys. Let’s check:

d = {'a': 1, 'b': 2}

print(d.keys())
>>> dict_keys(['a', 'b'])

print(type(d.keys()))
>>> <class 'dict_keys'>

d.keys()[0]
>>> TypeError: 'dict_keys' object is not subscriptable

This was not always so. In Python 2, the keys() method did return a list. See this old question.

To get an actual list of the keys, you can call list() on the dictionary:

print(list(d))
>>> ['a', 'b']

Then indexing works as expected:

print(list(d)[0])
>>> a

So you may want to change the line return settings.DATABASES.keys()[0] to this:

return list(settings.DATABASES)[0]

Answered By: Arne

Django app getting the error "TypeError: 'dict_keys' object is not subscriptable"

Question:

Answers: