Django Rest Framework: register multiple serializers in a ViewSet

Question

I am trying to create a custom API (not using models), but not showing the definition of the request in the schema (as a result, not showing it in swagger). My current code is:

views.py

class InfoViewSet(viewsets.ViewSet):

  @list_route(methods=['POST'])
    def some_method(self, request):
       data = JSONParser().parse(request)
       serializer = GetInfoSerializer(data=data)
       serializer.is_valid(raise_exception=True)
       info = get_data_from_elsewhere(serializer.data)
       return Response(info)

urls.py

router.register(r'^info', InfoViewSet, base_name='info')

serializers.py

class InfoSomeMethodSerializer(serializers.Serializer):

  list_id = serializers.ListField(child=serializers.IntegerField())
  password = serializers.CharField()

And he appears in swagger, but only part of the answer. How to register message settings? I am also not sure if I am using DRF correctly (I'm a beginner), so any correction will be appreciated.

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edit: I tried the serializer_class argument suggested by Linovia and did not work, I got:

TypeError: InfoViewSet() received an invalid keyword 'serializer_class'

I tried overriding the get_serializer_class method and did not work:

def get_serializer_class(self):
if self.action == 'some_method':
    return InfoSomeMethodSerializer