Django 1.6 renamed get_query_set functions to get_queryset.

Quoting https://docs.djangoproject.com/en/dev/releases/1.6/ :
> __get_query_set and similar methods renamed to get_queryset__
> 
> Methods that return a QuerySet such as Manager.get_query_set or ModelAdmin.queryset have been renamed to get_queryset.
It is safe to rename, as they added a metaclass that automagically copies the new method to old one and the other way around.

This leaves us with the _get_shared_query_set, which I renamed to _get_shared_queryset for consistency. This would break outside code using it. But it is an internal method and I cannot see why one would fiddle with it.