How to Show Related Products by Attribute - WooCommerce - php

Question

WooCommerce provides documentation on how to change the number of related products shown on a product page. Is there a way to change how they are related? It seems they are currently being related by category. Is there a way to show related products based on a single attribute?
Filter Below:
<?php
/**
* WooCommerce Extra Feature
* --------------------------
*
* Change number of related products on product page
* Set your own value for 'posts_per_page'
*
*/
function woo_related_products_limit() {
global $product;
$args = array(
'post_type' => 'product',
'no_found_rows' => 1,
'posts_per_page' => 6,
'ignore_sticky_posts' => 1,
'orderby' => $orderby,
'post__in' => $related,
'post__not_in' => array($product->id)
);
return $args;
}
add_filter( 'woocommerce_related_products_args', 'woo_related_products_limit' );

Answer 1

The filter woocommerce_related_products_args does not exist anymore. You can look into the function wc_get_related_products() to find which filters are currently available.
To replace categories by a single product attribute, I used the following code in my functions.php:
add_filter( 'woocommerce_get_related_product_cat_terms', 'my_attribute_relation', 10, 2);
/** Find related products using the attribute `pa_myAttrib`, throw away product categories. */
function my_attribute_relation( $original_term_ids, $product_id ) {
return wc_get_product_term_ids( $product_id, 'pa_myAttrib' );
}
In this case, product related by tags are kept. If you want to alter those, add a filter for woocommerce_get_related_product_tag_terms, too.

Answer 2

You should be able to do it by the taxonomy feature in wp_query... link
The attribute you want to target is 'woocommerce_attributes', not tested but this should work:
$args = array(
'post_type' => 'product',
'no_found_rows' => 1,
'posts_per_page' => 6,
'ignore_sticky_posts' => 1,
'orderby' => $orderby,
'post__in' => $related,
'post__not_in' => array($product->id),
'woocommerce_attributes' => 'attribute_slug',
);
return $args;