admin_users_controller.rb

module Admin
  class UsersController < ::AuthenticatedController
    load_and_authorize_resource

    def index
      users = User.untrashed
      render_with :users => users
    end

    def trashed
      rendering :index

      users = User.trashed
      render_with :users => users
    end
  end
end

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery

  def render_with(locals = {}, render_options = {})
    @_template_to_render ||= caller[0][/`([^']*)'/, 1]
    render @_template_to_render, {:locals => locals}.merge(render_options)
  end

  def rendering(template)
    @_template_to_render = template
  end
end