application_controller.rb

class ApplicationController < ActionController::Base
  # FORCE to implement content_for in controller
  # I'm not sure that this works with rails < 3.0.0rc
  def view_context
    super.tap do |view|
      (@_content_for || {}).each do |name,content|
        view.content_for name, content
      end
    end
  end
  def content_for(name, content) # no blocks allowed
    @_content_for ||= {}
    if @_content_for[name].respond_to?(:<<)
      @_content_for[name] << content
    else
      @_content_for[name] = content
    end
  end
end