Ensure total ordering of paginated lists (#3061)

src/pretix/api/views/voucher.py

@@ -31,9 +31,9 @@ from django_scopes import scopes_disabled
 from rest_framework import status, viewsets
 from rest_framework.decorators import action
 from rest_framework.exceptions import PermissionDenied
-from rest_framework.filters import OrderingFilter
 from rest_framework.response import Response
 
+from pretix.api.pagination import TotalOrderingFilter
 from pretix.api.serializers.voucher import VoucherSerializer
 from pretix.base.models import Voucher
 
@@ -59,7 +59,7 @@ with scopes_disabled():
 class VoucherViewSet(viewsets.ModelViewSet):
     serializer_class = VoucherSerializer
     queryset = Voucher.objects.none()
-    filter_backends = (DjangoFilterBackend, OrderingFilter)
+    filter_backends = (DjangoFilterBackend, TotalOrderingFilter)
     ordering = ('id',)
     ordering_fields = ('id', 'code', 'max_usages', 'valid_until', 'value')
     filterset_class = VoucherFilter