Added products that require a voucher to be bought/shown

src/pretix/base/migrations/0024_auto_20160728_1725.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.4 on 2016-07-28 17:25
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0023_auto_20160601_1039'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='item',
+            name='hide_without_voucher',
+            field=models.BooleanField(default=False, help_text='This product will be hidden from the event page until the user enters a voucher code that is specifically tied to this product (and not via a quota).', verbose_name='This product will only be shown if a voucher is redeemed.'),
+        ),
+        migrations.AddField(
+            model_name='item',
+            name='require_voucher',
+            field=models.BooleanField(default=False, help_text='To buy this product, the user needs a voucher that applies to this product either directly or via a quota.', verbose_name='This product can only be bought using a voucher.'),
+        ),
+    ]

src/pretix/base/models/items.py

@@ -173,6 +173,18 @@ class Item(LoggedModel):
         null=True, blank=True,
         help_text=_('This product will not be sold after the given date.')
     )
+    require_voucher = models.BooleanField(
+        verbose_name=_('This product can only be bought using a voucher.'),
+        default=False,
+        help_text=_('To buy this product, the user needs a voucher that applies to this product '
+                    'either directly or via a quota.')
+    )
+    hide_without_voucher = models.BooleanField(
+        verbose_name=_('This product will only be shown if a voucher is redeemed.'),
+        default=False,
+        help_text=_('This product will be hidden from the event page until the user enters a voucher '
+                    'code that is specifically tied to this product (and not via a quota).')
+    )
 
     class Meta:
         verbose_name = _("Product")

src/pretix/base/services/cart.py

@@ -32,7 +32,8 @@ error_messages = {
     'voucher_invalid': _('This voucher code is not known in our database.'),
     'voucher_redeemed': _('This voucher code has already been used an can only be used once.'),
     'voucher_expired': _('This voucher is expired.'),
-    'voucher_invalid_item': _('This voucher is not valid for this item.'),
+    'voucher_invalid_item': _('This voucher is not valid for this product.'),
+    'voucher_required': _('You need a valid voucher code to order this product.'),
 }
 
 
@@ -130,6 +131,12 @@ def _add_new_items(event: Event, items: List[dict],
         if voucher and voucher.quota and voucher.quota.pk not in [q.pk for q in quotas]:
             return error_messages['voucher_invalid_item']
 
+        if item.require_voucher and voucher is None:
+            return error_messages['voucher_required']
+
+        if item.hide_without_voucher and (voucher is None or voucher.item is None or voucher.item.pk != item.pk):
+            return error_messages['voucher_required']
+
         if len(quotas) == 0 or not item.is_available():
             err = err or error_messages['unavailable']
             continue