How to get the parent’s taxonomy?

  • I have 2 customs post type : “Artist” and “Concert”,
  • the “Concert” custom post type is the child of the “Artist” custom post type,
  • the “Artist” custom post type has a “genre” taxonomy.

What I’m trying to do (for instance): list all the concerts which belong to artists of the “pop” genre.

Here is the query of my dream:

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SELECT * FROM posts WHERE post_type = "concert" AND post_parent_term = "pop"

I think currently there is no such thing as post_parent_term, hope I’m wrong …
(I know i can add the “genre” taxonomy to the “Concert” custom post type and voilà! But I’m really curious to know if there is another way to achieve that).

Thanks by advance.

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3 comments

  1. What I’m trying to do (for instance):
    list all the concerts which belong to
    artists of the “pop” genre.

    You can do it in two steps:

    // 1. Get all the pop artist IDs
    $artist_ids = get_posts( array(
      'fields' => 'ids',
      'post_type' => 'artist',
      'genre' => 'pop'
    ) );
    
    // 2. Get all the concerts associated to those artists
    $artist_ids = implode( ',', array_map( 'absint', $artist_ids ) );
    
    $concerts = $wpdb->get_results( "
      SELECT * FROM $wpdb->posts
      WHERE post_type = 'concert'
      AND post_status = 'publish'
      AND post_parent IN ({$artist_ids})
      ORDER BY post_date DESC
    " );
    

    There’s a post_parent argument in WP_Query, but it doesn’t accept an array, hence the direct query.

  2. Not sure if its the right way but you could create nested loops:

    //first get all artists with the term pop

    $args = array(
        'tax_query' => array(
            array(
                'taxonomy' => 'genre',
                'field' => 'slug',
                'terms' => 'pop'
            ))
        'post_type' => 'Artist',
        'posts_per_page' => -1
        );
    $Artists = new WP_Query( $args );
    //loop through them and get there child posts of concerts 
    if ( $Artists->have_posts() ) { 
        while ( $Artists->have_posts() ) {
            $Artists->the_post();
            $last_artist = $post;
            $Concerts = new WP_Query();
            $Concerts->query(array(
                            'post_type' => 'concert',
                            'posts_per_page' => -1,
                            'post_parent' => $post->ID
                            ));
            while ( $Concerts->have_posts() ) {
                $Concerts->the_post();
                //do concert stuff here
                //the_title();
                //the_content();
            }
            wp_reset_postdata();
            $post = $last_artist;
        }
    }