Fix Python – Python Django Rest Framework UnorderedObjectListWarning


Asked By – Denise Mauldin

I upgraded from Django 1.10.4 to 1.11.1 and all of a sudden I’m getting a ton of these messages when I run my tests:

Pagination may yield inconsistent results with an unordered object_list: 
<QuerySet [<Group: Requester>]>
paginator = self.django_paginator_class(queryset, page_size)

I’ve traced that back to the Django Pagination module:

It seems to be related to my queryset code:

return get_user_model().objects.filter(

How can I find more details on this warning? It seems to be that I need to add a order_by(id) on the end of every filter, but I can’t seem to find which code needs the order_by added (because the warning doesn’t return a stack trace and so it happens randomly during my test run).



So by using @KlausD. verbosity tip, I looked at a test causing this error:

response = self.client.get('/api/orders/')

This goes to OrderViewSet but none of the things in get_queryset cause it and nothing in serializer class causes it. I have other tests that use the same code to get /api/orders and those don’t cause it…. What does DRF do after get_queryset?

If I put a traceback into pagination then I get a whole bunch of stuff related to django rest framework but nothing that points back to which of my queries is triggering the order warning.

Now we will see solution for issue: Python Django Rest Framework UnorderedObjectListWarning


So in order to fix this I had to find all of the all, offset, filter, and limit clauses and add a order_by clause to them. Some I fixed by adding a default ordering:

class Meta:
   ordering = ['-id']

In the ViewSets for Django Rest Framework (app/ I had to update all of the get_queryset methods as adding a default ordering didn’t seem to work.

Hope this helps someone else. 🙂

This question is answered By – Denise Mauldin

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