orders_controller.rb

class OrdersController < ApplicationController
  respond_to :json
  
  attr_accessor :order, :model
  helper_method :order
  protected     :order
    
  def create
    @order = model.create params[:order]
    respond_with @order
  end
  
  def show
    @order = model.find params[:id]
    respond_with @order
  end
  
protected

  def model
    @model ||= Order
  end
end