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

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?

Solution 1:^[1]

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

Solution 2:^[2]

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',)

Solution 3:^[3]

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()

Solution 4:^[4]

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

serializer_class = yourCreatedSerializer

Solution 5:^[5]

serializer = CitySerializer(queryset, many=True)

The above line should be replaced with

serializer_class = CitySerializer(queryset, many=True)

Solution 6:^[6]

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',)

Solution 7:^[7]

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]

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Cory Madden
Solution 2	Benyamin Jafari
Solution 3	franciscorode
Solution 4	Simas Joneliunas
Solution 5	Saeed
Solution 6	Tarak Sivakoti
Solution 7	Martin Brisiak

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

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]

Solution 6:[6]

Solution 7:[7]