Action Web Service - have layered AWS functions calling existing controllers

This is set to a layered dispatching mode

i want the API function find_all_orders to call an existing function in
app/controllers/order_controller.rb allowing this API function to
modify the states in the order_controller

any ideas?

app/controllers/backend_controller.rb

class BackendController < ApplicationController

  web_service_dispatching_mode :layered
  web_service :order, OrderService.new
  web_service_scaffold :invoke

end

app/apis/order_service.rb
Ask is a Model I have in my project

class OrderApi < ActionWebService::API::Base
  api_method :find_all_orders,
             :returns => [[Ask]]
end

class OrderService < ActionWebService::Base

  web_service_api OrderApi

  def find_all_orders
    asks = Ask.find(:all)
    pp asks
    asks
  end
end