Fixes bug in ActiveRecord::QueryMethods, #1697

Replace split on comma with a regexp that will reverse all ASC/DESC specifically

activerecord/lib/active_record/relation/query_methods.rb

@@ -305,10 +305,8 @@ module ActiveRecord
         when Arel::Nodes::Ordering
           o.reverse
         when String, Symbol
-          o.to_s.split(',').collect do |s|
-            s.strip!
-            s.gsub!(/\sasc\Z/i, ' DESC') || s.gsub!(/\sdesc\Z/i, ' ASC') || s.concat(' DESC')
-          end
+          s = o.to_s.gsub(/\s((desc)|(asc))\s*(,|\Z)/i) { |m| " #{$2 ? 'ASC' : 'DESC'}#{$4}" }
+          s.match(/\s(de|a)sc\Z/i) ? s : s.concat(" DESC")
         else
           o
         end

activerecord/test/cases/relations_test.rb

@@ -934,6 +934,11 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal 'zyke', FastCar.order_using_old_style.limit(1).first.name
   end
 
+  def test_order_with_function_and_last
+    authors = Author.scoped
+    assert_equal authors(:bob), authors.order( "id asc, COALESCE( organization_id, owned_essay_id)" ).last
+  end
+  
   def test_order_using_scoping
     car1 = CoolCar.order('id DESC').scoping do
       CoolCar.find(:first, :order => 'id asc')