How to modify get_queryset result value - django

Question

I am trying to modify my get_queryset result
Here is my my filter, view and serializer
view.py
class AccountDetailFilter(filters.FilterSet):
product_key = filters.CharFilter(name='product__product_name')
account_name = filters.AllValuesFilter(name='account__account_key')
service_provider_name = filters.CharFilter(name='product__service_provider__service_provider_name', )
allocation_key = filters.CharFilter(name='account__account_allocation__allocation_key')
class Meta:
model = BillingLine
fields = ('product_key', 'account_name', 'service_provider_name', 'allocation_key')
class AccountDetailList(generics.ListAPIView):
serializer_class = BillingSerializer
filter_backends = (DjangoFilterBackend,)
filter_class = AccountDetailFilter
def get_queryset(self):
now = datetime.datetime.now()
start_date = self.kwargs.get('start_date_time', now)
end_date = self.kwargs.get('end_date_time', now)
serializer = BillingSerializer(data={'start_date': start_date, 'end_date': end_date})
serializer.is_valid(raise_exception=True)
queryset = BillingLine.objects.select_related().filter(start_date__gte=start_date, end_date__lte=end_date)
queryset = queryset.order_by('-id')
print(queryset.count())
return queryset
Serializers.py
class BillingSerializer(serializers.Serializer):
id = serializers.IntegerField(read_only=True)
start_date = serializers.DateTimeField()
end_date = serializers.DateTimeField()
account_key = serializers.CharField(source='account_id',required=False)
product_key = serializers.CharField(source='product_id',required=False)
total_amount = serializers.FloatField(required=False)
After retrieving the result(ie get_queryset), I need to modify/add the data in the result . Is there any way to do this .
Also can we get the other field values to serializers from the result queryset. Because the queryset = BillingLine.objects.select_related().filter(start_date__gte=start_date, end_date__lte=end_date) is returning the almost all the data (sepecifally product name which is from products table)

Answer 1

Overriding get_queryset() method would serve your purpose perfectly.
For Example:
in your views.py :
class AccountDetailList(generics.ListAPIView):
serializer_class = BillingSerializer
filter_backends = (DjangoFilterBackend,)
filter_class = AccountDetailFilter
def get_queryset(self):
qs = YourModel.objects.filter(**filter_parameter)
return qs
def list(self):
try:
queryset = self.get_queryset()
serialize_value = YourSerializers(queryset,many=True,context={'request': self.request}).data
#Here in "serialize_value" you can append your data as much as you wish
return_val = {
'modified_serialize_value': serialize_value
}
return Response(return_val, status=status.HTTP_200_OK, content_type='application/json')
except Exception as E:
return Response({'error': str(E)}, status=status.HTTP_408_REQUEST_TIMEOUT, content_type='application/json')
I hope this will help.