Add an API

src/pretix/base/migrations/0137_auto_20190918_1820.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.2.1 on 2019-09-18 18:20
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+import pretix.base.models.fields
+import pretix.base.models.giftcards
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0136_auto_20190918_1537'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='giftcard',
+            name='secret',
+            field=models.CharField(db_index=True, default=pretix.base.models.giftcards.gen_giftcard_secret, max_length=190),
+        ),
+        migrations.AlterUniqueTogether(
+            name='giftcard',
+            unique_together={('secret', 'issuer')},
+        ),
+    ]

src/pretix/base/models/giftcards.py

@@ -48,7 +48,6 @@ class GiftCard(LoggedModel):
     secret = models.CharField(
         max_length=190,
         default=gen_giftcard_secret,
-        unique=True,
         db_index=True,
         verbose_name=_('Gift card code'),
     )
@@ -62,6 +61,9 @@ class GiftCard(LoggedModel):
     def value(self):
         return self.transactions.aggregate(s=Sum('value'))['s'] or Decimal('0.00')
 
+    class Meta:
+        unique_together = (('secret', 'issuer'),)
+
 
 class GiftCardTransaction(models.Model):
     card = models.ForeignKey(