Custom Post Type no longer appears in REST API

[nightillusions]

As the title suggests, the custom post type "transport-zones" is no longer returning in the REST API endpoint "https://www.gabco.de/wp-json/wp/v2/transport-zones". Instead, the standard posts are returning under the this endpoint like from the endpoint "https://www.gabco.de/wp-json/wp/v2/posts". In contrast, the custom taxonomy "countries" works beautifully: https://www.gabco.de/wp-json/wp/v2/countries/

This has all worked for a year so far and recently it no longer works. I don't know if it's related to some update, anyway I didn't find any hints in the changelogs.

I would be very grateful for any help!

Code:

<?php
require __DIR__ . '/../vendor/autoload.php';

add_action( 'init', function() {

    $menu_icon = 'data:image/svg+xml;base64,' . base64_encode('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path fill="black" d="M621.3 237.3l-58.5-58.5c-12-12-28.3-18.7-45.3-18.7H464c-17.7 0-32 14.3-32 32v144H32c-17.7 0-32 14.3-32 32v27.8c0 40.8 28.7 78.1 69.1 83.5 30.7 4.1 58.3-9.5 74.9-31.7 18.4 24.7 50.4 38.7 85.3 29.7 25.2-6.5 46.1-26.2 54.4-50.8 4.9-14.8 5.4-29.2 2.8-42.4h163.2c-2.7 13.2-2.2 27.6 2.8 42.4 8.4 25.1 29.9 44.9 55.6 51.1 52.8 12.8 100-26.9 100-77.6 0-5.5-.6-10.8-1.6-16H624c8.8 0 16-7.2 16-16v-85.5c0-17.1-6.7-33.3-18.7-45.3zM80 432c-17.6 0-32-14.4-32-32s14.4-32 32-32 32 14.4 32 32-14.4 32-32 32zm128 0c-17.6 0-32-14.4-32-32s14.4-32 32-32 32 14.4 32 32-14.4 32-32 32zm320 0c-17.6 0-32-14.4-32-32s14.4-32 32-32 32 14.4 32 32-14.4 32-32 32zm-48-176v-48h37.5c4.2 0 8.3 1.7 11.3 4.7l43.3 43.3H480zM32 304h336c17.7 0 32-14.3 32-32V64c0-17.7-14.3-32-32-32H32C14.3 32 0 46.3 0 64v208c0 17.7 14.3 32 32 32zM304 80h32v176h-32V80zm-80 0h32v176h-32V80zm-80 0h32v176h-32V80zm-80 0h32v176H64V80z"/></svg>');

    register_extended_taxonomy( 'countries', 'transport-zones', array(
        'meta_box' => 'dropdown',
        'checked_ontop' => true,
        'dashboard_glance' => true,
        'admin_cols' => array(
            'title'
        ),
        'hierarchical' => false,
        'show_in_quick_edit' => false,
        'labels' => array(
            'name'                          => __( 'Länder',                                           'transport-zones' ),
            'singular_name'                 => __( 'Land',                                             'transport-zones' ),
            'menu_name'                     => __( 'Länder',                                           'transport-zones' ),
            'all_items'                     => __( 'Alle Länder',                                      'transport-zones' ),
            'edit_item'                     => __( 'Bearbeiten',                                       'transport-zones' ),
            'view_item'                     => __( 'Zeige Land',                                       'transport-zones' ),
            'update_item'                   => __( 'Land aktualisieren',                               'transport-zones' ),
            'add_new_item'                  => __( 'Neues Land erstellen',                             'transport-zones' ),
            'new_item_name'                 => __( 'Name des neuen Lands',                             'transport-zones' ),
            'search_items'                  => __( 'Suche nach Land',                                  'transport-zones' ),
            'popular_items'                 => __( 'Beliebte Länder',                                  'transport-zones' ),
            'add_or_remove_items'           => __( 'Land hinzufügen oder entfernen',                   'transport-zones' ),
            'choose_from_most_used'         => __( 'Aus den am häufigsten verwendeten Ländern wählen', 'transport-zones' ),
            'name_admin_bar'                => __( 'Länder',                                           'transport-zones' ),
            'add_new'                       => __( 'Neues erstellen',                                  'transport-zones' ),
            'new_item'                      => __( 'Neues Land',                                       'transport-zones' ),
            'not_found'                     => __( 'Kein Land gefunden',                               'transport-zones' ),
            'not_found_in_trash'            => __( 'Kein Land im Papierkorb gefunden',                 'transport-zones' ),

            'parent_item'                   => __( 'Übergeordnetes Land',                              'transport-zones' ),
            'parent_item_colon'             => __( 'Übergeordnetes Land:',                             'transport-zones' ),
            'separate_items_with_commas'    => __( 'Länder mit Kommas trennen',                        'transport-zones' ),
        ),
        'show_in_rest' => true,
    ),
    array(
        'singular' => 'Land',
        'plural'   => 'Länder',
        'slug'     => 'countries'
    ) );

    register_extended_post_type( 'transport-zones', array(

        'enter_title_here'    => 'PLZ',
        'public'              => true,
        'menu_icon'           => $menu_icon,
        'delete_with_user'    => false,
        'has_archive'         => true,
        'show_in_rest'        => true,
        'taxonomies'          => array('countries'),
        'capability_type'     => 'post',
        'map_meta_cap'        => true,
        'supports' => array(
            'title',
//          'editor',
//          'excerpt',
//          'author',
//          'thumbnail',
//          'custom-fields',
//          'revisions',
//          'page-attributes',
//          'post-formats',
        ),
        'show_in_feed' => false,
        'archive' => array(
            'nopaging' => true
        ),
        'admin_cols' => array(
            'title' => array(
                'title'          => 'Transportzone'
            ),
            'category' => array(
                'title' => 'Land',
                'taxonomy' => 'countries'
            ),
            'price_vat' => array(
                'title'    => 'Preis inkl. MwSt.',
                'function' => function() {
                    global $post;
                    $details = get_field('attributes', $post->ID);
                    echo $details['price'] . ' €';
                },
            ),
            'price' => array(
                'title'    => 'Preis zzgl. MwSt.',
                'function' => function() {
                    global $post;
                    $details = get_field('attributes', $post->ID);
                    echo ( number_format( (float) $details['price'] / 1.19 , 2, ',', '.' )  ) . ' €';
                },
            ),
            'zone' => array(
                'title'    => 'Zone',
                'function' => function() {
                    global $post;
                    $details = get_field('attributes', $post->ID);
                    echo $details['zone'];
                },
            ),
        ),

        'admin_filters' => array(
            'countries' => array(
                'taxonomy' => 'countries'
            )
        ),
        'labels' => array(
            'name'                  => __( 'Transportzonen',                                'transport-zones' ),
            'singular_name'         => __( 'Transportzone',                                 'transport-zones' ),
            'menu_name'             => __( 'Transportzonen',                                'transport-zones' ),
            'name_admin_bar'        => __( 'Transportzonen',                                'transport-zones' ),
            'add_new'               => __( 'Neue erstellen',                                'transport-zones' ),
            'add_new_item'          => __( 'Neue Transportzone erstellen',                  'transport-zones' ),
            'edit_item'             => __( 'Bearbeiten',                                    'transport-zones' ),
            'new_item'              => __( 'Neue Transportzone',                            'transport-zones' ),
            'view_item'             => __( 'Zeige Transportzone',                           'transport-zones' ),
            'search_items'          => __( 'Suche nach Transportzone',                      'transport-zones' ),
            'not_found'             => __( 'Keine Transportzone gefunden',                  'transport-zones' ),
            'not_found_in_trash'    => __( 'Keine Transportzone im Papierkorb gefunden',    'transport-zones' ),
            'all_items'             => __( 'Alle Transportzonen',                           'transport-zones' ),
            'archives'              => __( 'Transportzonenseite',                           'transport-zones' ),
            'featured_image'        => __( 'Featured Image',                                'transport-zones' ),
            'set_featured_image'    => __( 'Set featured image',                            'transport-zones' ),
            'remove_featured_image' => __( 'Remove featured image',                         'transport-zones' ),
            'use_featured_image'    => __( 'Use as featured image',                         'transport-zones' ),
            'insert_into_item'      => __( 'In Transportzone einfügen',                     'transport-zones' ),
            'uploaded_to_this_item' => __( 'Zu dieser Transportzone hochgeladen',           'transport-zones' ),
            'views'                 => __( 'Filter Transportzonenliste',                    'transport-zones' ),
            'pagination'            => __( 'Transportzonenlisten Navigation',               'transport-zones' ),
            'list'                  => __( 'Transportzonenliste',                           'transport-zones' ),

            'parent_item'        => __( 'Übergeordnete Transportzone',                      'transport-zones' ),
            'parent_item_colon'  => __( 'Übergeordnete Transportzone:',                     'transport-zones' ),
        )
    ), array(

        'singular' => 'Transportzone',
        'plural'   => 'Transportzonen',
        'slug'     => 'transport-zones'

    ) );

} );

/**
 * Hide the term description in the edit form
 */
add_action( 'countries_add_form', function( $taxonomy )
{
    ?><style>.term-description-wrap{display:none;}</style><?php
}, 10, 2 );
/**
 * Hide the term description in the post_tag edit form
 */
add_action( "countries_edit_form", function( $tag, $taxonomy )
{
    ?><style>.term-description-wrap{display:none;}</style><?php
}, 10, 2 );
/**
 * Remove the 'description' column from the table in 'edit-tags.php'
 */
add_filter('manage_edit-countries_columns', function ( $columns )
{
    if( isset( $columns['description'] ) )
        unset( $columns['description'] );

    return $columns;
} );

[johnbillion]

Thanks for the report. Does this problem occur if you register the post type using the native register_post_type() function from WordPress? Or does it only happen with Extended CPTs?

[nightillusions]

Hi, with the native register_post_type() it works. So it only happens with Extended CPTs:

function transport_zones_init() {
    $labels = array(
        'name'                  => __( 'Transportzonen',                                'transport-zones' ),
        'singular_name'         => __( 'Transportzone',                                 'transport-zones' ),
        'menu_name'             => __( 'Transportzonen',                                'transport-zones' ),
        'name_admin_bar'        => __( 'Transportzonen',                                'transport-zones' ),
        'add_new'               => __( 'Neue erstellen',                                'transport-zones' ),
        'add_new_item'          => __( 'Neue Transportzone erstellen',                  'transport-zones' ),
        'edit_item'             => __( 'Bearbeiten',                                    'transport-zones' ),
        'new_item'              => __( 'Neue Transportzone',                            'transport-zones' ),
        'view_item'             => __( 'Zeige Transportzone',                           'transport-zones' ),
        'search_items'          => __( 'Suche nach Transportzone',                      'transport-zones' ),
        'not_found'             => __( 'Keine Transportzone gefunden',                  'transport-zones' ),
        'not_found_in_trash'    => __( 'Keine Transportzone im Papierkorb gefunden',    'transport-zones' ),
        'all_items'             => __( 'Alle Transportzonen',                           'transport-zones' ),
        'archives'              => __( 'Transportzonenseite',                           'transport-zones' ),
        'featured_image'        => __( 'Featured Image',                                'transport-zones' ),
        'set_featured_image'    => __( 'Set featured image',                            'transport-zones' ),
        'remove_featured_image' => __( 'Remove featured image',                         'transport-zones' ),
        'use_featured_image'    => __( 'Use as featured image',                         'transport-zones' ),
        'insert_into_item'      => __( 'In Transportzone einfügen',                     'transport-zones' ),
        'uploaded_to_this_item' => __( 'Zu dieser Transportzone hochgeladen',           'transport-zones' ),
        'views'                 => __( 'Filter Transportzonenliste',                    'transport-zones' ),
        'pagination'            => __( 'Transportzonenlisten Navigation',               'transport-zones' ),
        'list'                  => __( 'Transportzonenliste',                           'transport-zones' ),
        // Labels for hierarchical post types only.transport-zones
        'parent_item'        => __( 'Übergeordnete Transportzone',                      'transport-zones' ),
        'parent_item_colon'  => __( 'Übergeordnete Transportzone:',                     'transport-zones' ),
    );
    $args = array(
        'labels'             => $labels,
        'description'        => 'transport-zones custom post type.',
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'transport-zones' ),
        'capability_type'    => 'post',
        'has_archive'        => false,
        'hierarchical'       => false,
        'menu_position'      => 20,
        'supports'           => array( 'title' ),
        'taxonomies'         => array( 'category', 'post_tag' ),
        'show_in_rest'       => true
    );

    register_post_type( 'transport-zones', $args );
}
add_action( 'init', 'transport_zones_init' );

[nightillusions]

Okay, I close this Issue. Finally I found the problem: In WP 5.7 the rest_{$this->post_type}_query hook changed in the order position, because of the new "taxquery". My `rest{$this->post_type}_query` hook for ordering the rest response by custom field was the reason for all this. After some minor changes, everything works again.

Sorry ^^

[johnbillion]

Thanks for letting me know 👍

[kas5986]

Okay, I close this Issue. Finally I found the problem: In WP 5.7 the rest_{$this->post_type}_query hook changed in the order position, because of the new "taxquery". My `rest{$this->post_type}_query` hook for ordering the rest response by custom field was the reason for all this. After some minor changes, everything works again.

Sorry ^^

it still didn't get clear how did you solved this issue i am trying to query it through wp_query but i am not getting results for extended taxonomies using "tax_query"