From dee2f1969e2c8e73b1ef3b17302ef7c36c81088b Mon Sep 17 00:00:00 2001
From: Tony Pitale <tony.pitale@livingsocial.com>
Date: Wed, 27 Aug 2014 14:42:41 -0400
Subject: [PATCH] Rails does not support const_defined? in development mode;
 Use const_get instead, and rescue NameError

---
 lib/active_model/serializer.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index c06c58a0..b94b8a46 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -67,8 +67,10 @@ module ActiveModel
       else
         serializer_name = "#{resource.class.name}Serializer"
 
-        if Object.const_defined?(serializer_name)
+        begin
           Object.const_get(serializer_name)
+        rescue NameError
+          nil
         end
       end
     end