3 files changed, 7 insertions, 4 deletions
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index e039eb1288..26f4c16218 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -38,7 +38,7 @@ module Mime
   #       respond_to do |format|
   #         format.html
   #         format.ics { render :text => post.to_ics, :mime_type => Mime::Type["text/calendar"]  }
-  #         format.xml { render :xml => @people.to_xml }
+  #         format.xml { render :xml => @people }
   #       end
   #     end
   #   end
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 30e9e5634b..45075050eb 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -605,8 +605,9 @@ module ActionDispatch
         nil
       end
 
+      # The +options+ argument must be +nil+ or a hash whose keys are *symbols*.
       def url_for(options)
-        options = (options || {}).reverse_merge!(default_url_options)
+        options = default_url_options.merge(options || {})
 
         handle_positional_args(options)
 
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index 94db36ce1f..d75bb1c2de 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -144,10 +144,12 @@ module ActionDispatch
       #    # => 'http://somehost.org/tasks/testing?number=33'
       def url_for(options = nil)
         case options
+        when nil
+          _routes.url_for(url_options.symbolize_keys)
+        when Hash
+          _routes.url_for(options.symbolize_keys.reverse_merge!(url_options))
         when String
           options
-        when nil, Hash
-          _routes.url_for((options || {}).symbolize_keys.reverse_merge!(url_options))
         else
           polymorphic_url(options)
         end