API endpoint for positions on a check-in list

src/pretix/api/views/__init__.py

@@ -0,0 +1,23 @@
+from rest_framework.filters import OrderingFilter
+
+
+class RichOrderingFilter(OrderingFilter):
+
+    def filter_queryset(self, request, queryset, view):
+        ordering = self.get_ordering(request, queryset, view)
+
+        if ordering:
+            if hasattr(view, 'ordering_custom'):
+                newo = []
+                for ordering_part in ordering:
+                    ob = view.ordering_custom.get(ordering_part)
+                    if ob:
+                        ob = dict(ob)
+                        newo.append(ob.pop('_order'))
+                        queryset = queryset.annotate(**ob)
+                    else:
+                        newo.append(ordering_part)
+                ordering = newo
+            return queryset.order_by(*ordering)
+
+        return queryset