Skip past due swap requests when calculating events (#2718)

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Changed
+
+- Skip past due swap requests when calculating events ([2718](https://github.com/grafana/oncall/pull/2718))
+
 ### Fixed
 
 - Fix schedule final_events datetime filtering when splitting override ([#2715](https://github.com/grafana/oncall/pull/2715))

engine/apps/schedules/models/on_call_schedule.py

@@ -649,6 +649,9 @@ def _insert_event(index: int, event: ScheduleEvent) -> int:
 
         # apply swaps sequentially
         for swap in swaps:
+            if swap.is_past_due:
+                # ignore untaken expired requests
+                continue
             i = 0
             while i < len(events):
                 event = events.pop(i)

engine/apps/schedules/tests/test_on_call_schedule.py

@@ -2329,11 +2329,16 @@ def test_swap_request_no_changes(
 
     # setup swap requests
     tomorrow = today + timezone.timedelta(days=1)
+    # user not in schedule
     make_shift_swap_request(schedule, other_user, swap_start=today, swap_end=tomorrow)
+    # deleted request
     make_shift_swap_request(schedule, user, swap_start=today, swap_end=tomorrow, deleted_at=today)
+    # swap request in the past
     make_shift_swap_request(
         schedule, user, swap_start=today - timezone.timedelta(days=7), swap_end=tomorrow - timezone.timedelta(days=7)
     )
+    # untaken swap in progress (past due)
+    make_shift_swap_request(schedule, user, swap_start=today - timezone.timedelta(days=1), swap_end=tomorrow)
 
     events_after = schedule.filter_events(today, today + timezone.timedelta(days=2))
     assert events_before == events_after