title: Combining two different ActiveRecord collections into one
body: <p>I want create a visual timeline of all company events. The HTML for the timeline is built using a <code>loop</code>.</p>
  
  <p>For simplicity let's assume two models <code>Hire</code> &amp; <code>Deal</code>. Both models have a <code>date</code> attribute and some model specific attributes. How do I merge the <code>ActiveRecord</code> results of both models, and then <code>order</code> the combined hash by <code>date</code>, into a single hash that I can loop through?</p>