ItemUpdate: Save a few DB queries

src/pretix/plugins/ticketoutputpdf/forms.py

@@ -41,6 +41,7 @@ class TicketLayoutItemForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         self.event = kwargs.pop('event')
         self.sales_channel = kwargs.pop('sales_channel')
+        queryset = kwargs.pop('queryset')
         super().__init__(*args, **kwargs)
         if self.sales_channel.identifier != 'web':
             self.fields['layout'].label = _('PDF ticket layout for {channel}').format(
@@ -50,7 +51,7 @@ class TicketLayoutItemForm(forms.ModelForm):
         else:
             self.fields['layout'].label = _('PDF ticket layout')
             self.fields['layout'].empty_label = _('(Event default)')
-        self.fields['layout'].queryset = self.event.ticket_layouts.all()
+        self.fields['layout'].queryset = queryset
         self.fields['layout'].required = False
 
     def save(self, commit=True):

src/pretix/plugins/ticketoutputpdf/signals.py

@@ -64,6 +64,7 @@ def register_multievent_data(sender, **kwargs):
 @receiver(item_forms, dispatch_uid="pretix_ticketoutputpdf_item_forms")
 def control_item_forms(sender, request, item, **kwargs):
     forms = []
+    queryset = sender.ticket_layouts.all()
     for k, v in sorted(list(get_all_sales_channels().items()), key=lambda a: (int(a[0] != 'web'), a[0])):
         try:
             inst = TicketLayoutItem.objects.get(item=item, sales_channel=k)
@@ -73,6 +74,7 @@ def control_item_forms(sender, request, item, **kwargs):
             instance=inst,
             event=sender,
             sales_channel=v,
+            queryset=queryset,
             data=(request.POST if request.method == "POST" else None),
             prefix="ticketlayoutitem_{}".format(k)
         ))