title: Why does hirb.yml ignore User?
body: <p>I have a <code>config/hirb.yml</code> which looks a bit like this</p>
  
  <pre><code>:output:
    BlogEntry:
      :options:
        :fields:
          - id
          - title
          - url
    User:
      :options:
        :fields:
          - id
          - first_name
          - last_name
  </code></pre>
  
  <p>In the rails console, Hirb will properly format <code>BlogEntry.all</code> according to the hirb.yml specification, but will not do that for <code>User.all</code>. </p>
  
  <p>Why? And how do I fix it?</p>