title: Query date range in Mongoid 5.1
body: <p>How do you query a date range using Mongoid 5.1? I'm trying something like</p>
  
  <pre><code>Data.find(sid: 7, :created_at =&gt; (Time.parse('5-07-2015')..Time.now ))
  </code></pre>
  
  <p>but that gives me an error</p>
  
  <p>Any ideas?</p>