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