Fixes optimised named routes generating question mark followed by nothing when provided an empty hash as the last argument.

Signed-off-by: Michael Koziarski <michael@koziarski.com>
[#481 state:committed]

actionpack/lib/action_controller/routing/optimisations.rb

@@ -103,9 +103,10 @@ module ActionController
         end
 
         # This case uses almost the same code as positional arguments,
-        # but add an args.last.to_query on the end
+        # but add a question mark and args.last.to_query on the end,
+        # unless the last arg is empty
         def generation_code
-          super.insert(-2, '?#{args.last.to_query}')
+          super.insert(-2, '#{\'?\' + args.last.to_query unless args.last.empty?}')
         end
 
         # To avoid generating "http://localhost/?host=foo.example.com" we

actionpack/test/controller/routing_test.rb

@@ -1694,6 +1694,12 @@ uses_mocha 'LegacyRouteSet, Route, RouteSet and RouteLoading' do
         controller.send(:multi_url, 7, "hello", 5, :baz => "bar")
     end
 
+    def test_named_route_url_method_with_ordered_parameters_and_empty_hash
+      controller = setup_named_route_test
+      assert_equal "http://named.route.test/people/go/7/hello/joe/5",
+        controller.send(:multi_url, 7, "hello", 5, {})
+    end
+
     def test_named_route_url_method_with_no_positional_arguments
       controller = setup_named_route_test
       assert_equal "http://named.route.test/people?baz=bar",