From dc73c2c38feb018da37eda0a23c9411e15888eeb Mon Sep 17 00:00:00 2001
From: Damien Mathieu <42@dmathieu.com>
Date: Thu, 9 Jun 2011 09:01:50 +0200
Subject: [PATCH] don't reinitialize the arel_table unless the table_name
 changes

---
 activerecord/lib/active_record/base.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 7d02970ba0..37fae55619 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -659,6 +659,7 @@ module ActiveRecord #:nodoc:
       def set_table_name(value = nil, &block)
         @quoted_table_name = nil
         define_attr_method :table_name, value, &block
+        @arel_table = nil
 
         @arel_table = Arel::Table.new(table_name, arel_engine)
         @relation = Relation.new(self, arel_table)
@@ -892,7 +893,7 @@ module ActiveRecord #:nodoc:
       end
 
       def arel_table
-        Arel::Table.new(table_name, arel_engine)
+        @arel_table ||= Arel::Table.new(table_name, arel_engine)
       end
 
       def arel_engine