title: Kentico Cloud Delivery filter for parent element
body: <p>I have a content model "category" that contains products (also a content model). Now I have to get the category in which a product is linked. For this I got the product url_name (unique).</p>
  
  <p>I searched in the kentico-delivery-sdk (JS) docs for a filter, that can go deeply inside an object/linked content model.</p>
  
  <pre><code>       categoryByProduct: async (
            _,
            { product, limit = 1,depth, order, language }
          ) =&gt; {
            const query = deliveryClient.items();
            language &amp;&amp; query.languageParameter(getKcCodeFromLang(language));
            limit &amp;&amp; query.limitParameter(limit);
            depth &amp;&amp; query.depthParameter(depth);
            order &amp;&amp; query.orderParameter(order);
            query.containsFilter("elements.produkte[].url_name", product)
  
            const response = await query.getPromise();
            return response.items;
          },
  </code></pre>
  
  <p>With this approach I never get a response from GraphQL. Is this the wrong filter?</p>