From 84f71e42b79f00a97e95f6f472903b553ceda8ef Mon Sep 17 00:00:00 2001
From: Damien Mathieu <42@dmathieu.com>
Date: Thu, 9 Jun 2011 09:01:50 +0200
Subject: 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 900abd323b..2f283ff6bc 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
 
         @relation = Relation.new(self, arel_table)
       end
@@ -891,7 +892,7 @@ 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
-- 
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