title: Rails Paperclip how to delete attachment?
body: <p>I am using <a href="https://github.com/thoughtbot/paperclip">Paperclip</a> (w/ Amazon s3) on Rails 3. I want to delete an existing attachment <strong>without replacing it</strong> using an update action.</p>
  
  <p>I've only found one example of this <a href="http://thewebfellas.com/blog/2008/11/2/goodbye-attachment_fu-hello-paperclip">here</a> and could not get that to work, it just wouldn't delete and there was nothing in the logs to say why. I wanted to do something like this on the form:</p>
  
  <pre><code>&lt;%- unless @page.new_record? || !@page.image? -%&gt;
      &lt;%= f.check_box :image_delete, :label =&gt; 'Delete Image' %&gt;
  &lt;%- end -%&gt;
  </code></pre>
  
  <p>(page is the name of the model, image is the attribute name which holds the attachment)</p>
  
  <p>But how do I detect that checkbox and more importantly, how do I delete the image? I appreciate any help!</p>