title: How to Highlight Fields on Rails Validation Errors
body: <p>How do you display form field highlighting for fields that fail validation errors in Rails 3.1? I know that scaffolding automatically generates the css and controller code to handle this, but I was wondering if there was a way to generate that manually. I have already implemented the string display of error messages through: @user.errors.full_messages.each...etc, but I can't get the fields to become highlighted in red. Any ideas?</p>
  
  <p>Thanks.</p>