From e9ebf8b898e0dba4ca62cca7eb26987a9117a20e Mon Sep 17 00:00:00 2001
From: Pratik Naik <pratiknaik@gmail.com>
Date: Sun, 3 Jan 2010 03:56:21 +0530
Subject: Cache Relation#to_sql

---
 activerecord/lib/active_record/relation.rb | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'activerecord/lib/active_record/relation.rb')

diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index c828c0b751..31c7acf346 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -2,7 +2,6 @@ module ActiveRecord
   class Relation
     include QueryMethods, FinderMethods, CalculationMethods
 
-    delegate :to_sql, :to => :relation
     delegate :length, :collect, :map, :each, :all?, :to => :to_a
 
     attr_reader :relation, :klass
@@ -157,7 +156,7 @@ module ActiveRecord
     end
 
     def reset
-      @first = @last = @create_scope = @joined_tables = nil
+      @first = @last = @create_scope = @joined_tables = @to_sql = nil
       @records = []
       self
     end
@@ -180,6 +179,10 @@ module ActiveRecord
       @primary_key ||= table[@klass.primary_key]
     end
 
+    def to_sql
+      @to_sql ||= @relation.to_sql
+    end
+
     protected
 
     def method_missing(method, *args, &block)
-- 
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