product.rb

class Product < ActiveRecord::Base
end

products_controller.rb

class ProductController < ApplicationController

  # ...

  def create
    creates_product = CreatesProduct.new(Product, global_or_new_publisher)
    product = creates_product.call(product_params)
    # ...
  end
end

updates_product.rb

class CreatesProduct
  def initialize(factory, events)
    @factory = factory
    @events = events
  end
  
  def call(product_params)
    product = @factory.new(product_params)
    # do domething
    @events.broadcast(:before_save, product)
    # do domething
    result = product.save
    # do domething
    @events.broadcast(:after_save, product, result)
    # do domething
    result
  end
end