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Multisite cross-site post selection

  • This is a discussion in two parts.
    First is a piece of code for getting CPTs from another Site on a Multisite Network
    The second is a call for ideas on how I can filter this dynamically (like the Relationship field)
    The custom post type is called partner and the Select* field to load it into is called site7_partners

    This was implemented as a Relationship field around 10 years ago and, although I did find that code, it no longer works.

    function acf_load_partner( $field ) {
        $field['choices'] = array();
        $args = array(
            'post_type' => 'partner',
            'posts_per_page' => -1,
            'post_status' => 'publish',
            'orderby' => 'title',
            'order' => 'ASC',
        $page_query = new WP_Query($args);
        if ($page_query->have_posts()) {
            while ($page_query->have_posts()) {
                $field['choices'][get_the_ID()] = get_the_title();
        // return the field
        return $field;
    add_filter('acf/load_field/name=site7_partners', 'acf_load_partner', 999, 1);
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