Untitled

# app/controllers/application_controller.rb
class ApplicationController < ActionController
  after_filter :audit, :only => [:create, :update, :destroy]

  def audit
    # Cant remember if its controller.controller_name or just controller_name
    object_name = controller.controller_name.singularize
    object = instance_variable_get(object_name)

    object.audit_log(session[:user_id], controller.action_name)
  end

end

# app/controllers/products_controller.rb
class ProductsController < ApplicationController

  def create
    @product = Product.create(params[:product])
  end

end

# app/models/product.rb
class Product < ActiveRecord
  include Auditable
end

# lib/auditable.rb
module Audtiable

  def audit_log(user_id, action_name)
    case action_name
    when :create;  log_message = "User: #{user_id} created product: #{self.attributes.inspect}"
    when :update;  log_message = "woop woop woop"
    when :destroy; log_message = "tam tam"
    end

    logger.info(log_message)
  end

end