From 5f5527c726841cdefb82965a645d554767c5a6a9 Mon Sep 17 00:00:00 2001
From: Damien Mathieu <42@dmathieu.com>
Date: Mon, 5 Sep 2011 13:40:49 +0200
Subject: Use LIMIT sql word in last when it's possible

---
 activerecord/lib/active_record/relation/finder_methods.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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

diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index 2639c46709..83d650d3f4 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -134,7 +134,11 @@ module ActiveRecord
     def last(*args)
       if args.any?
         if args.first.kind_of?(Integer) || (loaded? && !args.first.kind_of?(Hash))
-          to_a.last(*args)
+          if order_values.empty? && reorder_value.nil?
+            order("#{primary_key} DESC").limit(*args).reverse
+          else
+            to_a.last(*args)
+          end
         else
           apply_finder_options(args.first).last
         end
-- 
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