From fcb92882b12a4a79a5c2901062cef009ec5f2fdc Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Fri, 30 Aug 2013 17:47:09 -0700
Subject: reduce relation allocations

---
 activerecord/lib/active_record/associations/preloader.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'activerecord/lib/active_record')

diff --git a/activerecord/lib/active_record/associations/preloader.rb b/activerecord/lib/active_record/associations/preloader.rb
index 82bf426b22..6cc9d6c079 100644
--- a/activerecord/lib/active_record/associations/preloader.rb
+++ b/activerecord/lib/active_record/associations/preloader.rb
@@ -85,9 +85,11 @@ module ActiveRecord
       def initialize(records, associations, preload_scope = nil)
         @records       = Array.wrap(records).compact.uniq
         @associations  = Array.wrap(associations)
-        @preload_scope = preload_scope || Relation.new(nil, nil)
+        @preload_scope = preload_scope || NULL_RELATION
       end
 
+      NULL_RELATION = Struct.new(:values).new({})
+
       def run
         unless records.empty?
           associations.each { |association| preload(association) }
-- 
cgit v1.2.3