title: Is there a way to put all the nil value at the end when sorting with mongodb/mongoid?
body: <p>Really not much more to tell than what is already in the question. </p>
  
  <p>using mongoid: </p>
  
  <pre><code>People.asc(:age)
  </code></pre>
  
  <p>I get nil value first.<br>
  is there a way to always return nil <strong>last</strong>, or to tell mongodb to treat nil as very high?</p>
  
  <p>Exactly like what is answered for <a href="https://stackoverflow.com/questions/5520628/rails-sort-nils-to-the-end-of-a-scope">the same problem in sql here</a></p>