Merge pull request #3775 from karevn/master

Please pull my changes - they fix a rare problem with tests framework

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -598,7 +598,8 @@ module ActionDispatch
               params[key] = URI.parser.unescape(value)
             end
           end
-
+          old_params = env[::ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+          env[::ActionDispatch::Routing::RouteSet::PARAMETERS_KEY] = (old_params || {}).merge(params)
           dispatcher = route.app
           while dispatcher.is_a?(Mapper::Constraints) && dispatcher.matches?(env) do
             dispatcher = dispatcher.app

actionpack/test/controller/routing_test.rb

@@ -1381,6 +1381,19 @@ class RouteSetTest < ActiveSupport::TestCase
     end
   end
   
+  def test_route_with_subdomain_and_constraints_must_receive_params
+    name_param = nil
+    set.draw do
+      match 'page/:name' => 'pages#show', :constraints => lambda {|request|
+        name_param = request.params[:name]
+        return true
+      }
+    end
+    assert_equal({:controller => 'pages', :action => 'show', :name => 'mypage'},
+      set.recognize_path('http://subdomain.example.org/page/mypage'))
+    assert_equal(name_param, 'mypage')
+  end
+  
   def test_route_requirement_recognize_with_ignore_case
     set.draw do
       match 'page/:name' => 'pages#show',