django.core.exceptions.ImproperlyConfigured. The included URLconf does not appear to have any patterns in it

Question

I am trying to do simple crud demo project API's for mobile using django rest framework and getting below error

django.core.exceptions.ImproperlyConfigured: The included URLconf '' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.

Project Name : crud_demo

App Name : crud_operations

crud_demo/urls.py

from django.conf.urls import include, url
from django.contrib import admin

admin.autodiscover()


urlpatterns= [
    url(r'^admin/', admin.site.urls),
    url(r'^crud_operations/', include('crud_operations.urls')),
]

crud_operations/models.py

  from django.db import models

# Create your models here.

class Member(models.Model):
    firstname = models.CharField(max_length=40)
    lastname = models.CharField(max_length=40)

crud_operations/serializers.py

from crud_operations.models import Member
from rest_framework import serializers

class MemberSerializer(serializers.ModelSerializer):
    class Meta:
        model = Member
        fields = ('firstname', 'lastname')

crud_operations/urls.py

from crud_operations import views

urlpatterns = [
     url(r'^models/$', include(views.model_list)),
     url(r'^models/(?P<pk>[0-9]+)$', include(views.model_detail)),
]

crud_operations/views.py

from django.shortcuts import render, redirect
from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework import status
from .models import Member
from crud_operations.serializers import MemberSerializer

@api_view(['GET', 'POST'])
def model_list(request):
    if request == 'GET':
        member = Member.objects.all()
        serializer = MemberSerializer(member)
        return Response(serializer.data)
    elif request == 'POST':
        serializer = MemberSerializer(data=request.DATA)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
    return Response({'key': request}, status=status.HTTP_200_OK)


@api_view(['GET', 'PUT', 'DELETE'])
def model_detail(request, pk):
    try:
        member = Member.objects.get(pk=pk)
    except Member.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)

    if request == 'GET':
        serializer = MemberSerializer(member)
        return Response(serializer.data)

    elif request == 'PUT':
        serializer = MemberSerializer(member, data=request.DATA)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        else:
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    elif request.method == 'DELETE':
        member.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

    return Response({'key': 'value'}, status=status.HTTP_200_OK)

EDIT for Rohan Varma Answer After changed crud_demo/urls.py

from crud_operations import views

urlpatterns = [
     url(r'^models/$', views.model_list),
     url(r'^models/(?P<pk>[0-9]+)$', views.model_detail),
]

Getting below error :

EDIT For Exprator Answer After changed crud_demo/urls.py from crud_operations import views

    urlpatterns = [
          path(r'^models/$', views.model_list),
          path(r'^models/(?P<pk>[0-9]+)$', views.model_detail),
    ]

Getting below error :

Solution

if you are using django 2.0.1 you should be aware that django has changed its urlpatterns from django 2.0 use the below code in your urls and remove that admin.autodiscover() as its not needed

from django.urls import path

urlpatterns = [
    path('articles/2003/', views.special_case_2003),
    path('articles/<yyyy:year>/', views.year_archive),
    ...
]

change this line

path(r'^models/(?P<pk>[0-9]+)$', views.model_detail),

to

path('models/<int:pk>/', views.model_detail),

and

path(r'^models/$', views.model_list),

to

path('models/', views.model_list),

Comments

[Naveen Kumar M]

Okay But now I am getting My Edit 1 issue after changing above lines. request == 'GET' is not true in views.py. Please can you help on this. Please refer EDIT for Rohan Varma Answer

[Exprator]

thats a different question, you need to put it as a question with the view code of that particular url, hope you understand the rule of stackoverflow

[Sebi]

Really can't understand WHY they can't just leave the code alone (as in backwards compatible). All these useless, unrequested "features" only end up costing time.