From c1e710aae130d6f99840ad7734b01d58afb31ad1 Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <santiago@wyeworks.com>
Date: Tue, 14 May 2013 16:24:59 -0700
Subject: [PATCH] Save result of calling associated_object in a local var

---
 lib/active_model/serializer/associations.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/active_model/serializer/associations.rb b/lib/active_model/serializer/associations.rb
index 2ee98f65..30ca5f4f 100644
--- a/lib/active_model/serializer/associations.rb
+++ b/lib/active_model/serializer/associations.rb
@@ -177,8 +177,10 @@ module ActiveModel
         end
 
         def serialize_ids
-          if associated_object
-            id = associated_object.read_attribute_for_serialization(embed_key)
+          object = associated_object
+
+          if object
+            id = object.read_attribute_for_serialization(embed_key)
             if polymorphic?
               {
                 :type => polymorphic_key,