ALM Filters - Default Archive Query

functions.php

<?php
function my_alm_filter_query_args( $args ){

    // Get the archive query object.
    $queried_obj = get_queried_object(); 

    // Confirm archive and query object is available.
    if ( is_archive() && $queried_obj && isset( $queried_obj->taxonomy ) ) {

        // The default taxonomy query.
        $default_tax_query = array(
            'taxonomy' => $queried_obj->taxonomy,
            'terms'    => $queried_obj->slug,
            'field'    => 'slug',
            'operator' => 'IN'
        );

        if ( isset( $args[ 'tax_query' ] ) && $args[ 'tax_query' ] ) {
            // Has tax query: Append to default to existing.
            $args['tax_query'][] = $default_tax_query;

        } else {
            // No tax query currently exists.
            $args['tax_query'] = array ( $default_tax_query );
        }
    }

    return $args;
}
add_filter( 'alm_query_args_category', 'my_alm_filter_query_args');