<%= attachments.select { |a| a.readable? and a.visible? } .map { |a| { :content_type => CGI::escape_html(a.content_type), :filename => CGI::escape_html(a.filename), :description => CGI::escape_html(a.description), :url => url_for(:controller => '/attachments', :action => 'show', :id => a, :filename => a.filename), :is_image => !!a.image? # doing the !! as image? for whatever reason returns null or a number } }.to_json.html_safe %>