Voucher: Add link to order in voucher history

src/pretix/base/models/base.py

@@ -178,7 +178,7 @@ class LoggedModel(models.Model, LoggingMixin):
 
         return LogEntry.objects.filter(
             content_type=self.logs_content_type, object_id=self.pk
-        ).select_related('user', 'event', 'oauth_application', 'api_token', 'device')
+        ).select_related('user', 'event', 'event__organizer', 'oauth_application', 'api_token', 'device')
 
 
 class LockModel:

src/pretix/control/logdisplay.py

@@ -571,6 +571,17 @@ def pretixcontrol_logentry_display(sender: Event, logentry: LogEntry, **kwargs):
         else:
             data['value'] = LazyI18nString(data['value'])
 
+    if logentry.action_type == "pretix.voucher.redeemed":
+        data = defaultdict(lambda: '?', data)
+        url = reverse('control:event.order', kwargs={
+            'event': logentry.event.slug,
+            'organizer': logentry.event.organizer.slug,
+            'code': data['order_code']
+        })
+        return mark_safe(plains[logentry.action_type].format(
+            order_code='<a href="{}">{}</a>'.format(url, data['order_code']),
+        ))
+
     if logentry.action_type in plains:
         data = defaultdict(lambda: '?', data)
         return plains[logentry.action_type].format_map(data)