hat can
be rendered by the route's template. In the above example, we use the
photo's ID (<code>params.photo_id</code>) as an argument to Ember Data's <code>findRecord</code>
method.</p>
<p>Note: A route with a dynamic segment will only have its <code>model</code> hook called
when it is entered via the URL. If the route is entered through a transition
(e.g. when using the <a href="../../templates/links/">link-to</a> Handlebars helper/), then a model context is
already provided and the hook is not executed. 