def chart_data(self, request, **kwargs): start_date = self.request.query_params.get('start_date', None) end_date = self.request.query_params.get('end_date', None) print(start_date) print(end_date) result = dict() result['sells_per_design'] = Bill.sells_per_design( start_date, end_date) result['sells_per_design_color'] = Bill.sells_per_design_color( start_date, end_date) result['sells_per_bg_color'] = Bill.sells_per_bg_color( start_date, end_date) result['sells_per_f_type'] = Bill.sells_per_f_type( start_date, end_date) result['sells_per_material'] = Bill.sells_per_material( start_date, end_date) result['sells_per_customer_age'] = Bill.profit_per_customer_age( start_date, end_date) result['sells_per_customer_type'] = Bill.profit_per_customer_type( start_date, end_date) return Response(result)