title: automate sale alert using ruby on rails
body: <p>situation:</p>
  
  <ul>
  <li>Customer click on "wish list" to a product that wanted. </li>
  <li>If the product have discount on it an auto-mail generator will email to that customer saying that product is on sales.</li>
  </ul>
  
  <p>is there any guideline or idea or even a gem that could help me out?</p>