serializers-multiple-need

viewsets.py
class ContractsViewSet(viewsets.ModelViewSet):
    serializer_class = ContractsSerializer (many=True)
    queryset = Contracts.objects.all()
    pagination_class = CustomPagination
    filter_backends = [filters.SearchFilter]
    search_fields = ['bundle','name']

    action_serializers = {
        'list': ContractsListSerializer,
        'retrieve': ContractsListSerializer,
        'partial_update':ContractsSerializer,
    }

   def get_serializer_class(self):
        try:
            return self.action_serializers [self.action]
        except (KeyError,AttributeError):
            return super().get_serializer_class()

serializers.py
class ContractsSerializer(serializers.ModelSerializer):

    class Meta:
        model = Contracts
        fields = ('id', 'name','bundle','state')
        extra_kwargs = {'name': {'required': False},'state': {'required': False}}