From 103fed966751680d4ac3dc8125b6807e34bb436a Mon Sep 17 00:00:00 2001
From: Kevin Brown <bass5098@gmail.com>
Date: Fri, 26 Jul 2013 10:59:51 -0400
Subject: [PATCH] Fixed reversed arguments in assertion

---
 rest_framework/serializers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 023f7ccfb..682a99a47 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -690,7 +690,7 @@ class ModelSerializer(Serializer):
             assert field_name in ret, \
                 "Noexistant field '%s' specified in `read_only_fields` " \
                 "on serializer '%s'." % \
-                (self.__class__.__name__, field_name)
+                (field_name, self.__class__.__name__)
             ret[field_name].read_only = True
 
         return ret