photomix/app/views/collections/index.html.erb

<div class="row">
  <%= render 'shared/home_slider' %>
</div>
<div class="clearfix"></div>
<div class="row">
 <div class="span12">
   <% @collections.in_groups_of(4).each do |group| %>
       <% unless group.empty? %>
           <ul class="thumbnails">
             <% group.compact.each_with_index do |collection, index| %>
                 <li class="span3">
                   <div class="thumbnail">
                     <%= image_tag collection.albums.first.photos.first.attachment.collection.url %>
                     <div class="caption">
                       <h5><%= collection.title %></h5>
                       <p><%= collection.description %></p>
                       <p class="view-btn"><%= link_to 'View', (collection_path(collection) unless collection.albums.empty? || collection.albums.first.photos.empty?), {:class => 'btn btn-primary'} %></p>
                       <%= ratings_for collection %>
                     </div>
                   </div>
                 </li>
             <% end %>
           </ul>
       <% end %>
   <% end %>
 </div>
</div>



<%= content_for :action_links do %>
    <% if current_user and current_user.has_role?("admin") %>
        <%= link_to "New collection", new_collection_path %>
    <% end %>
<% end %>