Orders API: Add subevent_before parameter

src/pretix/api/views/order.py

@@ -65,6 +65,7 @@ with scopes_disabled():
         modified_since = django_filters.IsoDateTimeFilter(field_name='last_modified', lookup_expr='gte')
         created_since = django_filters.IsoDateTimeFilter(field_name='datetime', lookup_expr='gte')
         subevent_after = django_filters.IsoDateTimeFilter(method='subevent_after_qs')
+        subevent_before = django_filters.IsoDateTimeFilter(method='subevent_before_qs')
         search = django_filters.CharFilter(method='search_qs')
 
         class Meta:
@@ -84,6 +85,19 @@ with scopes_disabled():
             ).filter(has_se_after=True)
             return qs
 
+        def subevent_before_qs(self, qs, name, value):
+            qs = qs.annotate(
+                has_se_before=Exists(
+                    OrderPosition.all.filter(
+                        subevent_id__in=SubEvent.objects.filter(
+                            Q(date_from__lt=value), event=OuterRef(OuterRef('event_id'))
+                        ).values_list('id'),
+                        order_id=OuterRef('pk'),
+                    )
+                )
+            ).filter(has_se_before=True)
+            return qs
+
         def search_qs(self, qs, name, value):
             u = value
             if "-" in value:

src/tests/api/test_orders.py

@@ -282,6 +282,19 @@ def test_order_list_filter_subevent_date(token_client, organizer, event, order,
     assert resp.status_code == 200
     assert [res] == resp.data['results']
 
+    resp = token_client.get('/api/v1/organizers/{}/events/{}/orders/?subevent_before={}'.format(
+        organizer.slug, event.slug,
+        (subevent.date_from - datetime.timedelta(hours=1)).isoformat().replace('+00:00', 'Z')
+    ))
+    assert resp.status_code == 200
+    assert [] == resp.data['results']
+    resp = token_client.get('/api/v1/organizers/{}/events/{}/orders/?subevent_before={}'.format(
+        organizer.slug, event.slug,
+        (subevent.date_from + datetime.timedelta(hours=1)).isoformat().replace('+00:00', 'Z')
+    ))
+    assert resp.status_code == 200
+    assert [res] == resp.data['results']
+
 
 @pytest.mark.django_db
 def test_order_list(token_client, organizer, event, order, item, taxrule, question):