title: Ember hook when transitioning from child route to parent route
body: <p>So I'm inside of an Ember child route, <code>attendee.search</code>.</p>
  
  <p>And I have a button there than transitions back to <code>attendee.index</code>.</p>
  
  <p>I need to reset the content of the attendee list when the transition occurs, but neither <code>setupController</code>, <code>model</code>, nor <code>redirect</code> are called when going from a child route to its parent.</p>
  
  <p><strong>How can I run a function every time a user lands on the <code>attendee</code> route?</strong></p>