Refs #105 -- Variation support for vouchers

src/pretix/base/migrations/0016_voucher_variation.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-03-20 10:14
+from __future__ import unicode_literals
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0015_auto_20160312_1924'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='voucher',
+            name='variation',
+            field=models.ForeignKey(blank=True, help_text='This variation of the product select above is being used.', null=True, on_delete=django.db.models.deletion.CASCADE, related_name='vouchers', to='pretixbase.ItemVariation', verbose_name='Product variation'),
+        ),
+    ]

src/pretix/base/models/items.py

@@ -493,17 +493,18 @@ class Quota(LoggedModel):
     def count_blocking_vouchers(self) -> int:
         from pretix.base.models import Voucher
         return Voucher.objects.filter(
-            item__quotas__in=[self],
-            block_quota=True,
-            redeemed=False
+            Q(item__quotas__in=[self]) &
+            Q(block_quota=True) &
+            Q(redeemed=False) &
+            self._position_lookup
         ).count()
 
     def count_in_cart(self) -> int:
         from pretix.base.models import CartPosition
 
         return CartPosition.objects.filter(
-            Q(expires__gte=now())
-            & self._position_lookup
+            Q(expires__gte=now()) &
+            self._position_lookup
         ).count()
 
     def count_orders(self) -> dict:

src/pretix/base/models/vouchers.py

@@ -5,7 +5,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from .base import LoggedModel
 from .event import Event
-from .items import Item
+from .items import Item, ItemVariation
 from .orders import CartPosition, OrderPosition
 
 
@@ -63,6 +63,14 @@ class Voucher(LoggedModel):
             "This product is added to the user's cart if the voucher is redeemed."
         )
     )
+    variation = models.ForeignKey(
+        ItemVariation, related_name='vouchers',
+        null=True, blank=True,
+        verbose_name=_("Product variation"),
+        help_text=_(
+            "This variation of the product select above is being used."
+        )
+    )
 
     class Meta:
         verbose_name = _("Voucher")

src/pretix/base/services/cart.py

@@ -153,7 +153,7 @@ def _add_voucher(event: Event, voucher: str, expiry: datetime, cart_id: str):
                     raise CartError(error_messages['unavailable'])
 
         CartPosition.objects.create(
-            event=event, item=v.item, variation=None,
+            event=event, item=v.item, variation=v.variation,
             price=v.price if v.price is not None else v.item.default_price,
             expires=expiry, cart_id=cart_id, voucher=v
         )