I can do request.path_parameters['controller'] and request.path_parameters['action'], but is there anything like request.path_parameters['template'] so I can discern which template file (such as index.html.erb) is being rendered?

I'm writing a method that automatically sets the body id to the template being rendered, for easy css manipulation:

  class ApplicationController < ActionController::Base
  ...
  after_filter :define_body_selector
  ...
  def define_body_selector
    # sets @body_id to the name of the template that will be rendered
    # ie. if users/index.html.erb was just rendered, @body_id gets set to "index"
    @body_id = ???
  end
  ...