title: Ruby on Rails Active Admin image Placeholders
body: <p>I am using activeadmin as the admin interface for an application I am working on and am trying to work out how to get image URL's to display as placeholders if an image is already uploaded. </p>
  
  <p>Activeadmin works using simpleform so in theory it should be relatively easy but I seem to be struggling. </p>
  
  <p>The code I currently have is:</p>
  
  <pre><code>ActiveAdmin.register Place do
  ...
  show do |place|
      attributes_table do
      ...
      (1..6).each do |i|
          row(:"image_#{i}") do
            if place.send("image_#{i}").present?
              image_tag(place.send("image_#{i}").index)
            else
              "None"
            end
          end
        end
        (1..6).each do |i|
          row(:"mood_board_image_#{i}") do
            if place.send("mood_board_image_#{i}").present?
              image_tag(place.("mood_board_image_#{i}").index)
            else
              "None"
            end
          end
        end
      end
    end
  ....
  end
  </code></pre>
  
  <p>At the moment I am just getting the default 'No file chosen' text when in the activeadmin interface. Any help would be very much appreciated :)</p>