Say you are selling Phones, Tablets, Smart Watches etc. – and all of those are children of parent category called Gadgets. In this case you have probably faced non-relevant related-products in product-single page of your WooCommerce website.
So, the idea is this: To remove parent categories from related-categories algorithm and to force WooCommerce to show related categories by last child category only (tablets for a tablet, phones for a phone etc. not tablets for a phone)
So let’s write small snippet for this:
add_filter( 'woocommerce_get_related_product_cat_terms',
function($termids,$product_id){
if(count($termids)<=1)return $termids;
$childonlys=[];
foreach($termids as $carr){
$termcheck=get_term_by('ID',$carr,'product_cat');
if($termcheck->parent==0)continue;
$childonlys[]=$carr;
}
return $childonlys;
},10,2
);
As you can see from the snippet, it gets all categories of the current product, checks each one whether it is parent or child product, if it is a parent product, then it removes parent product category from related product categories and keeps the most relevant onspare only.
What if the website is using multi-level hierarchy, not just 2-level?
For that case we can improve our code by checking all parent IDs of categories:
add_filter( 'woocommerce_get_related_product_cat_terms',
function($termids,$product_id){
if(count($termids)<=1)return $termids;
$childonlys=[];$termcheck=[];$parents=[];
foreach($termids as $carr){
$termcheck[$carr]=get_term_by('ID',$carr,'product_cat');
$parents[]=$termcheck->parent;
}
foreach($termcheck as $key=>$value){
if($value->parent==0
or in_array($key,$parents))
continue;
$childonlys[]=$key;
}
return $childonlys;
},10,2
);
Note that the changes will not take an effect immediately – because WooCommerce uses transient cache for related products block – so check back it in few hours after adding this snippet.
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It’s working but has one problem, If we open a sub-category product then it’s not showing any product in the related products section. Now what is the solution?
Can you show any example ?