Fix redemption of all-product vouchers with seating plans

src/pretix/base/models/vouchers.py

@@ -460,7 +460,7 @@ class Voucher(LoggedModel):
 
         return Order.objects.filter(all_positions__voucher__in=[self]).distinct()
 
-    def seating_available(self):
+    def seating_available(self, subevent):
         kwargs = {}
         if self.subevent:
             kwargs['subevent'] = self.subevent
@@ -469,4 +469,4 @@ class Voucher(LoggedModel):
         elif self.item_id:
             return self.item.seat_category_mappings.filter(**kwargs).exists()
         else:
-            return False
+            return bool(subevent.seating_plan) if subevent else self.event.seating_plan

src/pretix/presale/templates/pretixpresale/event/voucher.html

@@ -30,7 +30,7 @@
             <input type="hidden" name="subevent" value="{{ subevent.id|default_if_none:"" }}" />
             <input type="hidden" name="_voucher_code" value="{{ voucher.code }}">
 
-            {% if voucher.seating_available %}
+            {% if seating_available %}
                 {% if event.has_subevents %}
                     {% eventsignal event "pretix.presale.signals.render_seating_plan" request=request subevent=subevent voucher=voucher %}
                 {% else %}

src/pretix/presale/views/cart.py

@@ -435,6 +435,7 @@ class RedeemView(NoSearchIndexViewMixin, EventViewMixin, TemplateView):
         context['items_by_category'] = item_group_by_category(items)
 
         context['subevent'] = self.subevent
+        context['seating_available'] = self.voucher.seating_available(self.subevent)
 
         context['new_tab'] = (
             'require_cookie' in self.request.GET and