Action Web Service - have layered AWS functions calling exis

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