From ad063263bcaffb97f3e8d625d24c19d51b95b839 Mon Sep 17 00:00:00 2001
From: Andrew White <andyw@pixeltrix.co.uk>
Date: Thu, 19 Aug 2010 21:48:19 +0100
Subject: [PATCH] Optimize find_sti_class when store_full_sti_class is true

[#5403]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
---
 activerecord/lib/active_record/base.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index d9b4cd38317b2..90241dd8975cb 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -918,7 +918,11 @@ def find_sti_class(type_name)
             self
           else
             begin
-              compute_type(type_name)
+              if store_full_sti_class
+                ActiveSupport::Dependencies.constantize(type_name)
+              else
+                compute_type(type_name)
+              end
             rescue NameError
               raise SubclassNotFound,
                 "The single-table inheritance mechanism failed to locate the subclass: '#{type_name}'. " +