tap/app/views/order_products/_order_product.html.erb

<div class="col-md-3 form_products">
  <div class="thumbnail ">
    <div class="form_row center">
      <%= image_tag product.avatar %>
      <div class="caption">
        <h3><%= product.name %> - <%= content_tag :span, euro(product.price) %></h3>
        <p>
            <%= f.counter :count, 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 %>
        </p>
      </div>
    </div>
  </div>
</div>