Handling a custom taxonomy in WooCommerce wc_get_products function

I register a taxonomy using the standard action:

add_action( 'init', 'product_brand_order_taxonomy' );
function product_brand_order_taxonomy()  {
	$labels = array(
		'name'                       => 'Brand Heirarchy',
		'singular_name'              => 'Brand Heirarchy',
		'menu_name'                  => 'Brand Heirarchy',
		'all_items'                  => 'All Brand Heirarchies',
		'parent_item'                => 'Parent Brand Heirarchy',
		'parent_item_colon'          => 'Parent Brand Heirarchy:',
		'new_item_name'              => 'New Brand Heirarchy Name',
		'add_new_item'               => 'Add New Brand Heirarchy',
		'edit_item'                  => 'Edit Brand Heirarchy',
		'update_item'                => 'Update Brand Heirarchy',
		'separate_items_with_commas' => 'Separate Brand Heirarchy with commas',
		'search_items'               => 'Search Brand Heirarchies',
		'add_or_remove_items'        => 'Add or remove Brand Heirarchies',
		'choose_from_most_used'      => 'Choose from the most used Brand Heirarchies',
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => true,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
	);
	register_taxonomy( 'brand_heirarchy', 'product', $args );
	register_taxonomy_for_object_type( 'brand_heirarchy', 'product' );
}

Later I'd like to get products based on some arguments. I'd also like the brand_heirarchy to be included in the result.

$products = array(
    'post_status' => 'publish',
    'limit' => -1,
    'category' => $parent_brand_slugs
);

$products = wc_get_products($product_args);

In the returned data it will give me category_ids like

[category_ids] => Array
    (
        [0] => 30
        [1] => 27
        [2] => 25
        [3] => 24
    )

But I would like to have it also return the ids of the brand_heirarchy that are associated with the products.

Most things I see is about how to filter products by a custom taxonomy, I just want to know what taxonomies are as associated with a product.

I ran across this saying Woocommerce doesn't allow this: https://github.com/woocommerce/woocommerce/issues/13138

I looked at using this filter woocommerce_product_object_query_args but couldn't figure it out. There is also a product search filter, but it didn't look like it applied.

At this point, it seems my best bet is to loop over each product and use something like wp_get_object_terms( $data['id'], 'brand_heirarchy' ); but that seems inefficient.

Been a long time since I've done WordPress so really asking if there's a more efficient way I should be getting the taxonomies associated with each product.

Thanks.

It is completely possible to handle a custom taxonomy using wc_get_products(). You didn't search in the right place as this is handled within WC_Product_Data_Store_CPT class using the available filter hook woocommerce_product_data_store_cpt_get_products_query.

So for your custom product taxonomy brand_heirarchy, you will use the following:

add_filter( 'woocommerce_product_data_store_cpt_get_products_query', 'handle_custom_query_var', 10, 2 );
function handle_custom_query_var( $query_args, $query_vars ) {
	if ( ! empty( $query_vars['brand'] ) ) {
		$query_args['tax_query'][] = array(
			'taxonomy'          => 'brand_heirarchy',
			'field'             => 'slug',
			'terms'             => $query_vars['brand'],
		);
	}
	return $query_args;
}

Then now you can use your custom taxonomy in wc_get_products() function like:

$products = wc_get_products( array(
    'status' => 'publish',
    'limit' => -1,
    'brand' => $brand_slugs // array
) );

Now it should work.

Related documentation:

• wc_get_products and WC_Product_Query

• WP_Query Taxonomy Parameters