Add new gift card to orderposition relationship (#3291)

src/pretix/base/migrations/0238_giftcard_owner_ticket.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.18 on 2023-05-04 12:19
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0237_question_valid_string_length'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='giftcard',
+            name='owner_ticket',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, related_name='owned_gift_cards', to='pretixbase.orderposition'),
+        ),
+    ]

src/pretix/base/models/giftcards.py

@@ -66,6 +66,13 @@ class GiftCard(LoggedModel):
         on_delete=models.PROTECT,
         null=True, blank=True
     )
+    owner_ticket = models.ForeignKey(
+        'OrderPosition',
+        related_name='owned_gift_cards',
+        on_delete=models.PROTECT,
+        null=True, blank=True,
+        verbose_name=_('Owned by ticket holder')
+    )
     issuance = models.DateTimeField(
         auto_now_add=True,
     )