'CityListViewSet' should either include a `serializer_class` attribute, or override the `get_serializer_class()` method

Question:

I am assuming by the error in the title, once more here for clarity

'CityListViewSet' should either include a `serializer_class` attribute, 
or override the `get_serializer_class()` method.

that my serializer isn’t connected to my view, which in my code it should be. I’m not really sure where the bug is in this one. I wonder if any of you have seen something similar?

Here is the code.

Router: 

router.register(r'city-list', CityListViewSet, base_name='city-list')

view: 

class CityListViewSet(viewsets.ReadOnlyModelViewSet):                 
    queryset = Venue.objects.values('city').distinct()
    serializer = CitySerializer(queryset, many=True)
    ordering_fields = ('city',)
    ordering = ('city',)

serializer: 

class CitySerializer(serializers.ModelSerializer):    
    class Meta:
        model = City
        fields =('city',)

what is it that would be causing such an assertion error with the code seemly wired up correctly?

Asked By: user6781560

||
Source

Answers:

The exception says it itself. You need a serializer_class attribute. You have serializer.

Answered By: Cory Madden

Here you used a different model name:

view:

class CityListViewSet(viewsets.ReadOnlyModelViewSet):     #(viewsets.ModelViewSet)             
queryset = City.objects.values('city').distinct()
serializer = CitySerializer(queryset, many=True)
ordering_fields = ('city',)
ordering = ('city',)

import -> from .serializers import TaskSerializers,CitySerializer

serializer:

class CitySerializer(serializers.ModelSerializer):    
class Meta:
    model = City
    fields =('city',)
Answered By: Tarak Sivakoti

i got this error when declared post method in view and trying to send post data without serialize, if you are doing the request from javascript i solved it using JSON.stringify()

Answered By: franciscorode
serializer = CitySerializer(queryset, many=True)

The above line should be replaced with

serializer_class = CitySerializer(queryset, many=True)
Answered By: maguluri

you have to override the user just add

from django.contrib.auth.models import User
from rest_framework.permissions import IsAdminUser

and in createViewList

permission_classes = [IsAdminUser]
Answered By: Ashwani Kumar

error says you define a serializer attribute, you need to correct with writing
serializer_class attribute in your code,

serializer_class = yourCreatedSerializer
Answered By: Manoj Parmar

Add this code snippet to your views.py file

class CityListViewSet(viewsets.ReadOnlyModelViewSet):  # (viewsets.ModelViewSet) 
    serializer_class = CitySerializer
            
    queryset = City.objects.values('city').distinct()
    serializer = CitySerializer(queryset, many=True)
    ordering_fields = ('city',)
    ordering = ('city',)
Answered By: Aje

Rename this to

    serializer = CitySerializer(queryset, many=True)

This

    serializer_class = yourCreatedSerializer

Your job is done

Answered By: Harshil shrivastava