From d7a7a050e103def759d1e5694e5aaa35b1d03cd1 Mon Sep 17 00:00:00 2001
From: Eugene Gilburg <eugene.gilburg@gmail.com>
Date: Sun, 27 Oct 2013 23:58:23 -0700
Subject: Optimize none? and one? relation query methods to use LIMIT and
 COUNT.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Use SQL COUNT and LIMIT 1 queries for none? and one? methods if no block or limit is given,
instead of loading the entire collection to memory. The any? and many? methods already
follow this behavior.

[Eugene Gilburg & Rafael Mendonça França]
---
 activerecord/lib/active_record/null_relation.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

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

diff --git a/activerecord/lib/active_record/null_relation.rb b/activerecord/lib/active_record/null_relation.rb
index 63ca29305d..fa6eaa7e64 100644
--- a/activerecord/lib/active_record/null_relation.rb
+++ b/activerecord/lib/active_record/null_relation.rb
@@ -30,10 +30,18 @@ module ActiveRecord
       true
     end
 
+    def none?
+      true
+    end
+
     def any?
       false
     end
 
+    def one?
+      false
+    end
+
     def many?
       false
     end
-- 
cgit v1.2.3