trustieforge/app/views/bids/_attachment.html.erb

<%= link_to_attachment attachment, :class => 'icon icon-attachment', :download => true -%>
<% if attachment.is_text? %>
    <%= link_to image_tag('magnifier.png'),
                :controller => 'attachments', :action => 'show',
                :id => attachment, :filename => attachment.filename,:style => "width:50px"%>
<% end %>