From d82ee32aac323b7260cc95278c69b81d98dbd00a Mon Sep 17 00:00:00 2001
From: David Szotten <davidszotten@gmail.com>
Date: Thu, 2 Mar 2017 15:25:05 +0000
Subject: Fixed #27889 -- Fixed incorrect check error if ModelAdmin.ordering
 refers to 'pk'.

---
 django/contrib/admin/checks.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'django')

diff --git a/django/contrib/admin/checks.py b/django/contrib/admin/checks.py
index dad809a826..07d3341569 100644
--- a/django/contrib/admin/checks.py
+++ b/django/contrib/admin/checks.py
@@ -465,7 +465,8 @@ class BaseModelAdminChecks:
         else:
             if field_name.startswith('-'):
                 field_name = field_name[1:]
-
+            if field_name == 'pk':
+                return []
             try:
                 model._meta.get_field(field_name)
             except FieldDoesNotExist:
-- 
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