From f2dd05a6e661525908fe5ec99b52b5274b04a198 Mon Sep 17 00:00:00 2001
From: Tom Christie
Date: Wed, 3 Dec 2014 22:43:40 +0000
Subject: Improved nested update test in update().

Closes #2194.
---
 rest_framework/serializers.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'rest_framework')

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index d417ca80..b1175b5b 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -681,8 +681,8 @@ class ModelSerializer(Serializer):
 
     def update(self, instance, validated_attrs):
         assert not any(
-            isinstance(field, BaseSerializer) and not field.read_only
-            for field in self.fields.values()
+            isinstance(field, BaseSerializer) and (key in validated_attrs)
+            for key, field in self.fields.values()
         ), (
             'The `.update()` method does not suport nested writable fields '
             'by default. Write an explicit `.update()` method for serializer '
-- 
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