<%# no need for thumbnails unless there is more than one image %> <% if (@product.images + @product.variant_images).uniq.size > 1 %>

<% @product.images.each do |i| %>
• <%= link_to(image_tag(i.attachment.url(:mini)), i.attachment.url(:product)) %>
<% end %> <% if @product.has_variants? %> <% @product.variant_images.each do |i| %> <% next if @product.images.include?(i) %>
• <%= link_to(image_tag(i.attachment.url(:mini)), i.attachment.url(:product)) %>
<% end %> <% end %>

<% end %>