Deduplicate data on randomized order option, fix #933, fix #1026

app/api/views.py

@@ -1,5 +1,7 @@
 import collections
 import json
+import random
+
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.db import transaction
@@ -171,7 +173,9 @@ class DocumentList(generics.ListCreateAPIView):
 
         queryset = project.documents
         if project.randomize_document_order:
-            queryset = queryset.annotate(sort_id=F('id') % self.request.user.id).order_by('sort_id')
+            random.seed(self.request.user.id)
+            value = random.randrange(2, 20)
+            queryset = queryset.annotate(sort_id=F('id') % value).order_by('sort_id', 'id')
         else:
             queryset = queryset.order_by('id')