From 2c8f83556bf3ec9861315e11bc070753ef6bd97c Mon Sep 17 00:00:00 2001
From: Pratik Naik <pratiknaik@gmail.com>
Date: Sun, 27 Dec 2009 18:00:49 +0530
Subject: Add relation.exists?

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

(limited to 'activerecord/lib/active_record')

diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 87f6aa3643..4ca6871d0f 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -139,6 +139,12 @@ module ActiveRecord
       end
     end
 
+    def exists?(id = nil)
+      relation = select("#{@klass.quoted_table_name}.#{@klass.primary_key}").limit(1)
+      relation = relation.where(@klass.primary_key => id) if id
+      relation.first ? true : false
+    end
+
     def first
       if loaded?
         @records.first
-- 
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