Hi,

Hopefully someone can help! I have a shop using Woocommerce’s built in “Layered Nav” in a widget which allows filtration by product attributes. This works perfectly if the shop displays all categories – so by default. It does not work if I loop a specific category using either of these two methods:

A Function method:

add_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

function custom_pre_get_posts_query( $q ) {

	if ( ! $q->is_main_query() ) return;
	if ( ! $q->is_post_type_archive() ) return;
	
	if ( ! is_admin() && is_shop() ) {

		$q->set( 'tax_query', array(array(
			'taxonomy' => 'product_cat',
			'field' => 'slug',
			'terms' => array( 'category-main' ),
			'operator' => 'NOT IN'
		)));
	
	}

	remove_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

}

– (note this above shows everything else but the chosen product_cat.)

or in page (archive-product.php) to just show a chosen cat:

$args = array(
    'post_type' => 'product',
    'product_cat' => 'category-main',
    'posts_per_page' => 4
    );
$loop = new WP_Query( $args );
if ( $loop->have_posts() ) {
    while ( $loop->have_posts() ) : $loop->the_post();
        wc_get_template_part( 'content', 'product' );
    endwhile;
} else {
    echo __( 'No products found' );
}
wp_reset_postdata();

However, both of these methods stop the filter from working.
?filter_attributeName=nameOne,nameTwo
This, as a query, shows no different results: all results from the selected product_cat are listed regardless of filtered attributes.

What I need to know is how can I process the ?filter before/after the loop runs?

Last note: this is stock Woocommerce and stock Layered Nav widget.

Thanks