rails_website_template/app/views/admin_panel/files.html.erb

<div class="row">
	<%= render 'admin_panel/sidebar_nav' %>
	<div class="span9">
		<div class="page-header">
		  <h1><%= t "admin_panel.files" %> <%= link_to (t "admin_panel.upload_file"), new_upload_path, :class => 'btn btn-primary btn-mini' %></h1>
		</div>
		<ul class="thumbnails">
		    <% @uploads.each do |upload| %>
			   <li class="span3" style="">
			     <div class="thumbnail" style="height: 250px;">
				  <% if upload.file.content_type.start_with?('image') && upload.file.thumb.to_s != nil %>
				  	<%= image_tag upload.file.thumb.to_s %>
				  <% else %>
			       	<img src="http://placehold.it/300x200" alt="">
				  <% end %>
			       <h5 style="height: 40px"><%= link_to upload.title, upload_path(upload) %></h5>
			       <p><%= upload.description %></p>
			     </div>
			   </li>
		    <% end %>
		</ul>
	</div>
</div>