tap/app/views/products/_product.html.erb

<div class="col-md-3">
  <div class="thumbnail">
    <%= image_tag product.avatar %>
    <div class="caption">
      <h3><%= product.name %> - <%= euro(product.price) %> (<%= product.stock %>)</h3>
      <% if current_user.admin? %>
        <p>
          <%= link_to "Edit", edit_product_path(product), class: "btn btn-default" %>
          <%= link_to "Delete", product_path(product), method: :delete, class: "btn btn-danger", data: {confirm: 'Are you sure?'} %>
        </p>
      <% end %>
    </div>
  </div>
</div>