This query was working fine, but now i'm having a trouble with it since i've switched to multisite. I've added "global $switched" and "switch_to_blog(4)", and it works fine when i remove the "tax_query" argument! but when i add it back it returns no results.

global $switched;

$args = array( 
        'post_type' => 'grille', 
        'posts_per_page' => 1,
        'no_found_rows' => true,
        'meta_key'          => 'heure_debut',
        'orderby'           => 'meta_value',
        'order'             => 'DESC',
        'meta_query' => array(
                            'relation' => 'AND',
                                'key' => 'type_du_programme',
                                'value' => 'emission',
                                'compare' => '='
                                'key' => 'heure_debut',
                                'value' => $current_time,
                                'compare' => '<'
        'tax_query' => array(
                                'taxonomy' => 'jours_de_diffusion',
                                'field'    => 'slug',
                                'terms' => $current_day

    $loop = new WP_Query( $args );
  • Is jours_de_diffusion a registered taxonomy in the site with blog_id=4? – Pat J Oct 31 '17 at 15:37
  • it's defined in the functions.php and i can manage it from the backoffie of the blog having the id (4), so i guess yes. – hammed Oct 31 '17 at 15:44

I found out that in order to query wp posts via custom taxonomy, from a blog 1 to another blog 2, you have to register that custom taxonomy in both blogs, otherwhise it won't work. this is strange but true! anyways it works fine now.

| improve this answer | |
  • Thank you for posting your findings here. This saved me a lot of time today! I found out that you need to have custom taxonomies registered on blog 1, if you want to use wp_set_object_terms with switch_to_blog(n), too. This somewhat makes sense after looking how switch_to_blog() works. It just changes the database and without including any plugin files and such from the switched blog. – Antti Koskinen Feb 13 '19 at 17:51

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