title: Conditionally changing background color in rails according to order status
body: <p>I'm trying to change the background of a view depending on whether a user saved an order or not. So a menu item will be highlighted when the user has already saved an order, and not highlighted when he has not.</p>
  
  <p>One solution is to create two partials, and to render each conditionally based on the user action.</p>
  
  <p>But it seems overkill to re-render an entire partial, and bad form in general. What is the best way to change the background color?</p>