title: How to set Default format for activerecord fields of type string?
body: <p>Here's an easy one:</p>
  
  <p>How do I go about setting the default format for a string field in ActiveRecord?</p>
  
  <p>I've tried the following:</p>
  
  <pre><code>def phone_number_f
    "...#{phone_number}format_here..."
  end
  </code></pre>
  
  <p>But I'd like to keep the method name the same as the field name.</p>