title: how to use contents of <ActionDispatch::Http::UploadedFile:0x007f91fc5c88d0> in Rails?
body: <p>I've uploaded and encrypted two images to my app, and now I need to use them in an <code>img_tag</code>. How can I retrieve the contents of this string and display them to the user?</p>
  
  <pre><code>Model.document_front: &lt;ActionDispatch::Http::UploadedFile:0x007f91fc5c88d0&gt;
  </code></pre>