fix: reduce agenda data calculation time (ietf-tools#4622)

* fix: reduce agenda data calculation time

* doc: improve docstring for preprocess_assingments_for_agenda

Author: rjsparks

ietf/meeting/helpers.py

@@ -95,6 +95,7 @@ def preprocess_assignments_for_agenda(assignments_queryset, meeting, extra_prefe
       a.session.historic_parent
       a.session.rescheduled_to (if rescheduled)
       a.session.prefetched_active_materials
+      a.session.order_number
     """
     assignments_queryset = assignments_queryset.prefetch_related(
             'timeslot', 'timeslot__type', 'timeslot__meeting',

ietf/meeting/views.py

@@ -1621,6 +1621,8 @@ def api_get_agenda_data (request, num=None):
     # Get Floor Plans
     floors = FloorPlan.objects.filter(meeting=meeting).order_by('order')
 
+    #debug.show('all([(item.acronym,item.session.order_number,item.session.order_in_meeting()) for item in filtered_assignments])')
+
     return JsonResponse({
         "meeting": {
             "number": schedule.meeting.number,
@@ -1712,7 +1714,7 @@ def agenda_extract_schedule (item):
         } if item.session.agenda() is not None else {
             "url": None
         },
-        "orderInMeeting": item.session.order_in_meeting(),
+        "orderInMeeting": item.session.order_number,
         "short": item.session.short if item.session.short else item.session.short_name,
         "sessionToken": item.session.docname_token_only_for_multiple(),
         "links": {