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WordPress: REST API メモ v2

WordPressのREST APIを使用するときのメモです。
個人の環境によって変わってくる所もあると思うので、参考までにご覧ください。

下記のプラグインを使用する想定で書いています。

・プラグイン
カスタムフィールドの登録:Advanced Custom Field
カスタムポストの登録:Custom Post Type UI

投稿のエンドポイント

http://example.com/wp-json/wp/v2/posts/<ID>

個別ページのエンドポイント

http://example.com/wp-json/wp/v2/pages/<ID>

Advanced Custom Fieldsの内容をAPIに追加する時

functions.php
function wp_rest_api_alter() {
    $params = array(
        'get_callback'    => function($data, $field, $request, $type){
            if (function_exists('get_fields')) {
                return get_fields($data['id']);
            }
            return [];
            },
        'update_callback' => null,
        'schema'          => null,
    );
    register_api_field( 'page', 'fields', $params );
    register_api_field( 'post', 'fields', $params );
}
add_action( 'rest_api_init', 'wp_rest_api_alter');

カスタムポストタイプのエンドポイントを作る

http://example.com/wp-json/wp/v2/<custom-post-type>

functions.php
function sb_add_cpts_to_api() {
    global $wp_post_types;

    // Add CPT slugs here
    $arr = ['<post-typeA>','<post-typeB>','<post-typeC>'];

    foreach( $arr as $key ) {

    // If the post type doesn't exist, skip it
    if( !$wp_post_types[$key] )
        continue;

        $wp_post_types[$key]->show_in_rest = true;
        $wp_post_types[$key]->rest_base = $key;
    }
}
add_action( 'init', 'sb_add_cpts_to_api', 30 );
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