Do not attach empty files for orders without tickets

src/pretix/base/models/orders.py

@@ -686,6 +686,15 @@ class Order(LockModel, LoggedModel):
                     }
                 )
 
+    @property
+    def positions_with_tickets(self):
+        for op in self.positions.all():
+            if op.addon_to_id and not self.event.settings.ticket_download_addons:
+                continue
+            if not op.item.admission and not self.event.settings.ticket_download_nonadm:
+                continue
+            yield op
+
 
 def answerfile_name(instance, filename: str) -> str:
     secret = get_random_string(length=32, allowed_chars=string.ascii_letters + string.digits)

src/pretix/base/services/tickets.py

@@ -117,6 +117,8 @@ def get_tickets_for_order(order):
 
         if p.multi_download_enabled:
             try:
+                if len(order.positions_with_tickets) == 0:
+                    continue
                 ct = CachedCombinedTicket.objects.filter(
                     order=order, provider=p.identifier, file__isnull=False
                 ).last()
@@ -132,11 +134,7 @@ def get_tickets_for_order(order):
             except:
                 logger.exception('Failed to generate ticket.')
         else:
-            for pos in order.positions.all():
-                if pos.addon_to and not order.event.settings.ticket_download_addons:
-                    continue
-                if not pos.item.admission and not order.event.settings.ticket_download_nonadm:
-                    continue
+            for pos in order.positions_with_tickets:
                 try:
                     ct = CachedTicket.objects.filter(
                         order_position=pos, provider=p.identifier, file__isnull=False

src/pretix/base/ticketoutput.py

@@ -70,14 +70,12 @@ class BaseTicketOutput:
         If you override this method, make sure that positions that are addons (i.e. ``addon_to``
         is set) are only outputted if the event setting ``ticket_download_addons`` is active.
         Do the same for positions that are non-admission without ``ticket_download_nonadm`` active.
+        If you want, you can just iterate over ``order.positions_with_tickets`` which applies the
+        appropriate filters for you.
         """
         with tempfile.TemporaryDirectory() as d:
             with ZipFile(os.path.join(d, 'tmp.zip'), 'w') as zipf:
-                for pos in order.positions.all():
-                    if pos.addon_to_id and not self.event.settings.ticket_download_addons:
-                        continue
-                    if not pos.item.admission and not self.event.settings.ticket_download_nonadm:
-                        continue
+                for pos in order.positions_with_tickets:
                     fname, __, content = self.generate(pos)
                     zipf.writestr('{}-{}{}'.format(
                         order.code, pos.positionid, os.path.splitext(fname)[1]

src/pretix/plugins/ticketoutputpdf/ticketoutput.py

@@ -73,12 +73,7 @@ class PdfTicketOutput(BaseTicketOutput):
     def generate_order(self, order: Order):
         merger = PdfFileMerger()
         with language(order.locale):
-            for op in order.positions.all():
-                if op.addon_to_id and not self.event.settings.ticket_download_addons:
-                    continue
-                if not op.item.admission and not self.event.settings.ticket_download_nonadm:
-                    continue
-
+            for op in order.positions_with_tickets:
                 layout = self.layout_map.get(
                     (op.item_id, order.sales_channel),
                     self.layout_map.get(

src/pretix/presale/views/order.py

@@ -94,7 +94,7 @@ class OrderDetails(EventViewMixin, OrderDetailMixin, CartMixin, TemplateView):
         can_download = all([r for rr, r in allow_ticket_download.send(self.request.event, order=self.order)])
         if self.request.event.settings.ticket_download_date:
             ctx['ticket_download_date'] = self.order.ticket_download_date
-        ctx['can_download'] = can_download and self.order.ticket_download_available
+        ctx['can_download'] = can_download and self.order.ticket_download_available and self.order.positions_with_tickets
         ctx['download_buttons'] = self.download_buttons
         ctx['cart'] = self.get_cart(
             answers=True, downloads=ctx['can_download'],