Query to get Attributes based on Product Category selected in WooCommerce? - wordpress

Question

I need to implement custom functionality like "Product filter by Attributes" widget works in woocommerce.
For example in Product category page:
In Parent Category like Clothing, it loads all the attributes filter (pa_color , pa_size).
Now, when you check sub-category of that parent category i.e., Hoodies. It gets filtered and loads only related attributes (pa_color).
Please suggest the query to achieve this requirement.

Answer 1

This is how I am getting the data as per my requirement :
$filter_raw = array();
$attrs_raw = wc_get_attribute_taxonomy_names(); // Getting data of attributes assign in backend.
$cat_name = get_term($request['category'], 'product_cat', ARRAY_A ); //Category data by category ID.
$args = array(
'category' => array($cat_name['slug'] )
);
foreach( wc_get_products($args) as $product ){
foreach( $product->get_attributes() as $attr_name => $attr ){
$filter_raw[] = $attr_name;
if(is_array($attr->get_terms())){
foreach( $attr->get_terms() as $term ){
$terms_raw[] = $term->name;
}
}
}
}
$filters = array_unique(array_intersect((array)$filter_raw,(array)$attrs_raw)); //Filtering the attributes used by products in particular category
if(is_array($filters)){
foreach ( $filters as $filter ){
$terms = get_terms( $filter );
if ( ! empty( $terms ) ) {
$return['items'][ $filter ] = array(
'id' => $filter,
'type' => 'checkbox',
'label' => $this->decode_html( wc_attribute_label( $filter ) ),
);
foreach ( $terms as $term ) {
if(in_array($term->name,$terms_raw)){ //Filtering the terms from attribute used by the products in a category and showing required result.
$return['items'][ $filter ]['values'][] = array(
'label' => $this->decode_html( $term->name ),
'value' => $term->slug,
);
}
}
}
}
}
print_r($return);