class AnalyticsView(GenericAPIView):
 filterset_class = OrderFilter
 filter_backends = [DjangoFilterBackend, SearchFilter]
 queryset = Order.objects.select_related('delivery', 'platform')
 
 def get(self, request, *args, **kwargs):
 queryset = self.filter_queryset(self.get_queryset())
 monthly_data = queryset.annotate(
 month=TruncMonth('date_of_sale')
 ).values('month').annotate(
 total_quantity=Sum('quantity_sold')
 ).order_by('month')
 
 data = [
 {
 'month': item['month'].strftime("%Y-%m"),
 value_field: item['total_quantity']
 }
 for item in queryset
 ] 
 return Response({'results': data })

 def get_filter_form(self, data, view, request):
 if not hasattr(view, 'get_queryset') or not hasattr(view, 'filter_backends'):
 return
 # Infer if this is a list view or not.
 paginator = getattr(view, 'paginator', None)
 if isinstance(data, list):
 pass
 elif paginator is not None and data is not None:
 try:
 paginator.get_results(data)
 except (TypeError, KeyError):
 return
 elif not isinstance(data, list):
 return