args for sorting taxo AND Meta-Num-Field – $query = new WP_Query($args);

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I searched the net, I asked chatgpt…. Nothing! Everything does not work…

​

I want to display my posts of the post type “book”. The books have a taxonomy called “series”. The “series” has the field “name”. And each post has a volume number.

​

I would like to display them sorted as follows:

SERIES A (taxonomy -> name)

\- Volume 1 (volume number)

\- Volume 2

… Volume x

SERIES B

\- Volume 1

… Volume x

​

I can plot and sort a single series, but I can’t get the args to sort all the post books that way.

​

So far I am filtering my posts like this – it works.

$args = array(

‘post\_type’ => ‘book’,

‘tax\_query’ => array(

array(

‘taxonomy’ => ‘book\_series’,

‘field’ => ‘name’,

‘terms’ => $book\_series,

),

),

// it will be sorted by BAND-NR 1 … x

‘meta\_key’ => ‘book\_band’,

‘orderby’ => ‘meta\_value\_num’,

‘order’ => ‘ASC’,

);

​

But I don’t want to filter, I want to list quasi all books as described above. Anyone have any idea what the args for $query = new WP\_Query($args); might look like?

Am grateful for any help.

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