From e311b763e193b41c6a679ddbcf813702691145a0 Mon Sep 17 00:00:00 2001
From: Pavel Savchenko
Date: Fri, 30 Nov 2012 01:34:46 +0200
Subject: add traverse_related feature + tests (fixes issue#461)

---
 rest_framework/serializers.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'rest_framework/serializers.py')

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 4519ab05..e63f4783 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -272,10 +272,18 @@ class BaseSerializer(Field):
         Override default so that we can apply ModelSerializer as a nested
         field to relationships.
         """
-        obj = getattr(obj, self.source or field_name)
 
-        if is_simple_callable(obj):
-            obj = obj()
+        if self.source:
+            value = obj
+            for component in self.source.split('.'):
+                value = getattr(value, component)
+                if is_simple_callable(value):
+                    value = value()
+            obj = value
+        else:
+            value = getattr(obj, field_name)
+            if is_simple_callable(value):
+                obj = value()
 
         # If the object has an "all" method, assume it's a relationship
         if is_simple_callable(getattr(obj, 'all', None)):
-- 
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