title: Rails: Link to sub directory within images
body: <p>I'm seeding some items into my app. The item photos are kept under items sub directory like so: <code>assets/images/items/1.jpg</code></p>
  
  <p>I want to do something like:</p>
  
  <pre><code>all_images.each do
     item = Item.new(photo: "1.jpg")
  end
  </code></pre>
  
  <p>So that I can reference my items in rails views like <code>image_tag(some_item.photo)</code></p>
  
  <p>But right now, the url "avatars/1.jpg" is showing up as broken.</p>