Check-in list API: Add `subevent_match` filter

src/pretix/api/views/checkin.py

@@ -1,3 +1,4 @@
+import django_filters
 from django.core.exceptions import ValidationError
 from django.db.models import Count, F, Max, OuterRef, Prefetch, Q, Subquery
 from django.db.models.functions import Coalesce
@@ -27,10 +28,17 @@ from pretix.helpers.database import FixedOrderBy
 
 with scopes_disabled():
     class CheckinListFilter(FilterSet):
+        subevent_match = django_filters.NumberFilter(method='subevent_match_qs')
+
         class Meta:
             model = CheckinList
             fields = ['subevent']
 
+        def subevent_match_qs(self, qs, name, value):
+            return qs.filter(
+                Q(subevent_id=value) | Q(subevent_id__isnull=True)
+            )
+
 
 class CheckinListViewSet(viewsets.ModelViewSet):
     serializer_class = CheckinListSerializer

src/tests/api/test_checkin.py

@@ -162,11 +162,25 @@ def test_list_list(token_client, organizer, event, clist, item, subevent):
     resp = token_client.get(
         '/api/v1/organizers/{}/events/{}/checkinlists/?subevent={}'.format(organizer.slug, event.slug, subevent.pk))
     assert [res] == resp.data['results']
+    resp = token_client.get(
+        '/api/v1/organizers/{}/events/{}/checkinlists/?subevent_match={}'.format(organizer.slug, event.slug, subevent.pk))
+    assert [res] == resp.data['results']
     with scopes_disabled():
         se2 = event.subevents.create(name="Foobar", date_from=datetime.datetime(2017, 12, 27, 10, 0, 0, tzinfo=UTC))
     resp = token_client.get(
         '/api/v1/organizers/{}/events/{}/checkinlists/?subevent={}'.format(organizer.slug, event.slug, se2.pk))
     assert [] == resp.data['results']
+    resp = token_client.get(
+        '/api/v1/organizers/{}/events/{}/checkinlists/?subevent_match={}'.format(organizer.slug, event.slug, se2.pk))
+    assert [] == resp.data['results']
+
+    clist.subevent = None
+    clist.save()
+    res["subevent"] = None
+
+    resp = token_client.get(
+        '/api/v1/organizers/{}/events/{}/checkinlists/?subevent_match={}'.format(organizer.slug, event.slug, se2.pk))
+    assert [res] == resp.data['results']
 
 
 @pytest.mark.django_db