Fix order method to accept relation attributes.

Signed-off-by: José Valim <jose.valim@gmail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 43519db976..ece287d771 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -503,13 +503,13 @@ class RelationTest < ActiveRecord::TestCase
 
   def test_many
     posts = Post.scoped
-  
+
     assert_queries(2) do
       assert posts.many? # Uses COUNT()
       assert posts.many? {|p| p.id > 0 }
       assert ! posts.many? {|p| p.id < 2 }
     end
-  
+
     assert posts.loaded?
   end
 
@@ -593,4 +593,8 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal "lifo", relation.author
     assert_equal "lifo", relation.limit(1).author
   end
+
+  def test_order_by_relation_attribute
+    assert_equal Post.order(Post.arel_table[:title]).all, Post.order("title").all
+  end
 end