From 05a49c77181db8f8d0700ac57fc7f13d1fd112a5 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Wed, 4 Aug 2010 16:22:16 -0700
Subject: [PATCH] avoid passing lists of lists to the group clause

---
 activerecord/lib/active_record/relation/query_methods.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb
index a92d180442..dfacde80f9 100644
--- a/activerecord/lib/active_record/relation/query_methods.rb
+++ b/activerecord/lib/active_record/relation/query_methods.rb
@@ -31,7 +31,7 @@ module ActiveRecord
     end
 
     def group(*args)
-      clone.tap {|r| r.group_values += args if args.present? }
+      clone.tap {|r| r.group_values += args.flatten if args.present? }
     end
 
     def order(*args)