From 4ba9c508ec1d59dd43154022479a37558f8c19f3 Mon Sep 17 00:00:00 2001
From: Szymon Nowak <szimek@gmail.com>
Date: Mon, 14 Oct 2013 19:51:29 +0200
Subject: [PATCH] In Relation#empty? use #exists? instead of #count.

---
 activerecord/CHANGELOG.md                  | 4 ++++
 activerecord/lib/active_record/relation.rb | 3 +--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 815e7c71fe..22a37810bc 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Make `Relation#empty?` use `exists?` instead of `count`.
+
+    *Szymon Nowak*
+
 *   `rake db:structure:dump` no longer crashes when the port was specified as `Fixnum`.
 
     *Kenta Okamoto*
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index cfaf566ec4..81548117b0 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -244,8 +244,7 @@ module ActiveRecord
     def empty?
       return @records.empty? if loaded?
 
-      c = count(:all)
-      c.respond_to?(:zero?) ? c.zero? : c.empty?
+      limit_value == 0 ? true : !exists?
     end
 
     # Returns true if there are any records.