From 733f03fba35cb13ad53723b0b15d439e40da32ad Mon Sep 17 00:00:00 2001
From: Tom Christie
Date: Sat, 8 Dec 2012 12:48:38 +0000
Subject: Fix for emptystring as nullable FK

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

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index bffc0fb0..c5726ff0 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -351,9 +351,9 @@ class RelatedField(WritableField):
 
         value = data.get(field_name)
 
-        if value is None and not self.blank:
+        if value in (None, '') and not self.blank:
             raise ValidationError('Value may not be null')
-        elif value is None and self.blank:
+        elif value in (None, '') and self.blank:
             into[(self.source or field_name)] = None
         else:
             into[(self.source or field_name)] = self.from_native(value)
-- 
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