From 43f91f5a09c9e305234229e13571241f48203bc9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Chmela=C5=99?= <ondrej.chmelar@fragaria.cz>
Date: Tue, 24 Sep 2019 10:23:46 +0200
Subject: [PATCH] Fix sorting by related fields

Allow sorting by `related_field__field_name` using django notation with `__` as separator.
---
 rest_framework/pagination.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index 1a1ba2f65..81fc73d7b 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -873,7 +873,9 @@ class CursorPagination(BasePagination):
         if isinstance(instance, dict):
             attr = instance[field_name]
         else:
-            attr = getattr(instance, field_name)
+            attr = instance
+            for field in field_name.split('__'):
+                attr = getattr(attr, field)
         return str(attr)
 
     def get_paginated_response(self, data):