Check-in: New flags for check-in lists (#3577)

src/pretix/base/migrations/0247_checkinlist.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.2.4 on 2023-09-06 11:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pretixbase", "0246_bigint"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="checkinlist",
+            name="consider_tickets_used",
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name="checkinlist",
+            name="ignore_in_statistics",
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/models/checkin.py

@@ -62,6 +62,16 @@ class CheckinList(LoggedModel):
                                              'and valid for check-in regardless of which date they are purchased for. '
                                              'You can limit their validity through the advanced check-in rules, '
                                              'though.'))
+    ignore_in_statistics = models.BooleanField(
+        verbose_name=pgettext_lazy('checkin', 'Ignore check-ins on this list in statistics'),
+        default=False
+    )
+    consider_tickets_used = models.BooleanField(
+        verbose_name=pgettext_lazy('checkin', 'Tickets with a check-in on this list should be considered "used"'),
+        help_text=_('This is relevant in various situations, e.g. for deciding if a ticket can still be canceled by '
+                    'the customer.'),
+        default=True
+    )
     include_pending = models.BooleanField(verbose_name=pgettext_lazy('checkin', 'Include pending orders'),
                                           default=False,
                                           help_text=_('With this option, people will be able to check in even if the '

src/pretix/base/models/orders.py

@@ -633,7 +633,7 @@ class Order(LockModel, LoggedModel):
         positions = list(
             self.positions.all().annotate(
                 has_variations=Exists(ItemVariation.objects.filter(item_id=OuterRef('item_id'))),
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('issued_gift_cards')
         )
         if self.event.settings.change_allow_user_if_checked_in:
@@ -665,7 +665,7 @@ class Order(LockModel, LoggedModel):
             return False
         positions = list(
             self.positions.all().annotate(
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('issued_gift_cards')
         )
         cancelable = all([op.item.allow_cancel and not op.has_checkin and not op.blocked for op in positions])
@@ -820,7 +820,7 @@ class Order(LockModel, LoggedModel):
 
         positions = list(
             self.positions.all().annotate(
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('item__questions')
         )
         if not self.event.settings.allow_modifications_after_checkin:

src/pretix/base/services/orders.py

@@ -1996,7 +1996,7 @@ class OrderChangeManager:
                     for a in current_addons[cp][k][:current_num - input_num]:
                         if a.canceled:
                             continue
-                        if a.checkins.exists():
+                        if a.checkins.filter(list__consider_tickets_used=True).exists():
                             raise OrderError(
                                 error_messages['addon_already_checked_in'] % {
                                     'addon': str(a.item.name),