title: ruby on rails - error accessing to public directory
body: <p>I would like to ask you if is possible to show data, which I've to
  saved in /public/my_dir_for_data.</p>
  
  <p>If I try to display an image from this directory, I get "Routing error".
  Probably when I would to saved the data to root of my application, e.g.
  /my_data, everything will be ok... but I like this structure of RoR
  application and I will be glad, if I could to use the directory in in
  /public...</p>
  
  <p>Exist any way, how to do? (and simultaneously security?)</p>