tap/app/views/order_items/_order_item.html.erb

<div class="col-md-3 form_products">
  <div class="thumbnail ">
    <div class="form_row center">
      <div class="form_row_image">
        <%= image_tag product.avatar %>
      </div>
      <div class="caption">
        <h6>
          <% if product.calories %>
              <%= content_tag :small do
                concat product.calories
                concat ' kcal'
              end
              %>
          <% else %>
              &nbsp;
          <% end %>
        </h6>
        <h4 class="text-nowrap">
        <%= content_tag :span, product.name %>
        <%= content_tag :small, euro(product.price) %>
        </h4>
        <%= f.counter :count, max: 1000, skip_label: true, wrapper_class: "input-group", class: "row_counter" %>
        <%= f.fields_for :product do |product| %>
          <%= product.hidden_field :price_cents, class: :price %>
          <%= product.hidden_field :stock, class: :stock %>
        <% end %>
      </div>
    </div>
  </div>
</div>