Sorting series

Hello @edwinkort

Sorry about the delayed response, it took me a while figure this one out. You can try the code below.

function wzy_change_sort_order( $query ) {
	if ( is_tax( 'rcno_series' ) ) {
		// @see https://developer.ww.wp.xz.cn/reference/classes/wp_query/#order-orderby-parameters
		$query->set( 'order', 'DESC' );
		$query->set( 'orderby', 'meta_value_num' );
		$query->set( 'meta_key', 'rcno_book_series_number' );
	}
}
add_action( 'pre_get_posts', 'wzy_change_sort_order' );

Also, I can make no guarantee on how it will work with decimals as that is a function of how WordPress itself works.

You’d add it to your theme’s functions.php file.

I am now confused as to what it is you’re asking.

I just checked your website and the series taxonomy archive page is being correctly sorted by series number in descending order.

Did you try changing the sort order?

Do that resolve this request?