render layout not working for application.xml.builder

I have layouts/application.xml.builder which is rendered for all xml reponses. In controllers I have:

format.xml { render :layout => true, :xml => @some_var }

This works perfectly fine in rails 2.1.2 and stopped working after upgrading to 2.2.2. It appears that :layout => true is not taking any effect. The @some_var.to_xml is rendered just not with application.xl.builder any more. I googled around and tried a bunch of different approaches but stuck. Anyone seen something like this?

Thanks,

Heinz,

Yes I have. I wrote a tiny app to illustrate my problem.

I have one model - user.rb: class User < ActiveRecord::Base   def name     "foo"   end end

and users_controller.rb: class UsersController < ApplicationController   def index     respond_to do |format|       format.html       format.xml do         render :xml => User.new, :layout => 'application'       end     end   end end

I defined routes for it: map.resources :users

Then I change this to vary rails' versions for testing: RAILS_GEM_VERSION = '2.2.2' unless defined? RAILS_GEM_VERSION

Using :layout => 'application' or not doesn't matter. When I hit http://localhost:3000/users.xml I get this output:

Processing UsersController#index to xml (for 127.0.0.1 at 2009-03-16 17:41:10) [GET]   [4;36;1mSQL (0.3ms) [0;1mSET SQL_AUTO_IS_NULL=0   [4;35;1mUser Columns (1.5ms) SHOW FIELDS FROM `users` Rendering template within layouts/application Completed in 34ms (View: 6, DB: 2) | 200 OK [http://localhost/ users.xml]

As you can see, it is renderin layouts/application.

I have defined views/layouts/application.xml.builder as such: xml.instruct!

xml.response do     xml << yield end

And what I get is: