From d3a30d40b3d2f4e280340fa1c7497358a6bcac99 Mon Sep 17 00:00:00 2001
From: auvipy <auvipy@gmail.com>
Date: Thu, 21 Apr 2016 00:44:33 +0600
Subject: [PATCH] converted get_pk to use remote field

---
 rest_framework/utils/model_meta.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rest_framework/utils/model_meta.py b/rest_framework/utils/model_meta.py
index c3424a679..8859cb59c 100644
--- a/rest_framework/utils/model_meta.py
+++ b/rest_framework/utils/model_meta.py
@@ -12,6 +12,7 @@ from django.apps import apps
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
 from django.utils import six
+from rest_framework.compat import get_remote_field
 
 FieldInfo = namedtuple('FieldResult', [
     'pk',  # Model field instance
@@ -76,9 +77,10 @@ def get_field_info(model):
 
 def _get_pk(opts):
     pk = opts.pk
-    while pk.rel and pk.rel.parent_link:
+    remote_field = get_remote_field(pk)
+    while remote_field and remote_field.parent_link:
         # If model is a child via multi-table inheritance, use parent's pk.
-        pk = pk.rel.to._meta.pk
+        pk = remote_field.to._meta.pk
 
     return pk