trying to get category_url_title from a relationship in a grid field

Question

Having a strange issue with grid, categories and relationships. On my site i have a channel with products and services. On the services pages i need my client to be able to select related products to be shown, so i used a grid field with relationships to products. The products are categorised, so i want to see the category_url_title in the url.

I checked this thread and followed that approach however i'm not getting this to output anything. (http://www.site.com/producten//systeemoefeningen/ for what should be http://www.site.com/producten/oefenen/systeemoefeningen/)

{services_grid_products}
  <li><a href="/producten/category/
      {services_grid_products:product}
         {services_grid_products:product:categories}
             {services_grid_products:product:categories:category_url_title}
         {/services_grid_products:product:categories}
      {/services_grid_products:product}/{url_title}/" 
      title="
      {services_grid_products:product}
          {services_grid_products:product:title}
      {/services_grid_products:product}"> 
      {services_grid_products:product}
          {services_grid_products:product:title}
      {/services_grid_products:product}</a></li>
{/services_grid_products}

I know i can do this with an embed too, however i'm trying to avoid them as much as possible.

Answer 1

edited version (and just saw that Kevin Cupp beat me to it!): Just tested this and only needed to use {category_url_title}.

So try:

{services_grid_products:product:categories}
    {category_url_title}
{/services_grid_products:product:categories}