ktyr report

公開済みの記事を編集してプレビューするとカスタムフィールドの値が古いままなのを解決する
※公式対応までのつなぎ

　
functions.phpに下記追記

/**
 * $dataをjsonで出力
 */
function echo_json($data)
{
    header("Content-Type: application/json; charset=utf-8");
    echo json_encode($data);
}
/**
 * テンプレートのadmin.jsを読み込む
 */
function add_admin_style()
{
    $path_js = get_template_directory_uri().'/scripts/admin.js';
    wp_enqueue_script('admin_script', $path_js);
}
add_action('admin_enqueue_scripts', 'add_admin_style');
/**
 * ajaxで送信されたカスタムフィールドの値をdbへ保存
 */
function save_acf_by_ajax()
{
    if(empty($_POST['post_id'])){
        echo_json(['success' => false,'preview_id' => 0]);
        wp_die();
        exit;
    }
    $post_id = $_POST['post_id'];
    $post_status = get_post_status($post_id);
    if($post_status !== "publish"){
        echo_json(['success' => false,'preview_id' => 0]);
        wp_die();
        exit;
    }
    $preview_id = 0;
    global $wpdb;
    $row = $wpdb->get_row("SELECT p.ID FROM $wpdb->posts AS p WHERE p.post_type = '_cf_preview_id' AND p.post_parent = ${post_id}");
    if(empty($row)) {
        $post = array(
            'post_name'      => '_cf_preview_id',
            'post_title'     => '_cf_preview_id',
            'post_status'    => 'private',
            'post_type'      => '_cf_preview_id',
            'post_author'    => 1,
            'ping_status'    => 'closed',
            'post_parent'    => $post_id,
            'comment_status' => 'closed',
        );
        $preview_id = wp_insert_post($post);
    }else{
        $preview_id = $row->ID;
    }
    unset($_POST['action']);
    unset($_POST['post_id']);
    unset($_POST['preview_id']);
    if(!empty($preview_id)) {
        foreach ($_POST as $key => $value) {
            update_field($key, $value, $preview_id);
        }
    }
    $_POST['post_id'] = $post_id;
    $_POST['preview_id'] = $preview_id;
    $_POST['success'] = !empty($preview_id);
    echo_json($_POST);
    wp_die();
}
add_action( 'wp_ajax_save_acf_by_ajax_action', 'save_acf_by_ajax' );
/**
 * プレビュー時カスタムフィールドの値用のpostidを返す
 */
function get_cf_post_id($post_id = '')
{
    if(empty($post_id)){
        $post_id = get_the_ID();
    }
    $cf_post_id = $post_id;
    if(is_preview()){
        $post_status = get_post_status($post_id);
        if($post_status === 'publish'){
            global $wpdb;
            $row = $wpdb->get_row("SELECT p.ID FROM $wpdb->posts AS p WHERE p.post_type = '_cf_preview_id' AND p.post_parent = ${post_id}");
            if (!empty($row)) {
                $cf_post_id = $row->ID;
            }
        }
    }
    return $cf_post_id;
}

wp-content/themes/テーマ/assets/js/admin.jsに下記追記

class CFSaveManager {
    qsall(selector,elm){
        if(!elm)elm = document;
        return elm.querySelectorAll(selector);
    }
    qs(selector,elm){
        if(!elm)elm = document;
        return elm.querySelector(selector);
    }
    constructor(){
    }
    /* 初期化 */
    init(){
        this.initAutoSave();
    }
    /* プレビューボタンにイベント設定 */
    initAutoSave(){
        const button = this.qs('.block-editor-post-preview__button-toggle');
        if(!button){
            setTimeout(() => {
                this.initAutoSave();
            },200);
            return;
        }
        button.addEventListener('click',() => {
            this.autoSave();
        });
    }
    /* ajaxでカスタムフィールドの値をapiへ送信・保存 */
    autoSave(){
        const elm = this.qs('[name="post_ID"]');
        const form = this.qs('form.metabox-location-normal');
        const formData = new FormData(form);
        let sendFormData = new FormData();
        for (let item of formData) {
            if(/^acf\[.+\]$/.test(item[0])){
                var matches = item[0].match(/acf\[(.+)\]/);
                if(matches && 1 < matches.length){
                    sendFormData.append(matches[1],item[1]);
                }
            }else{
                sendFormData.append(item[0],item[1]);
            }
        }
        sendFormData.append('action','save_acf_by_ajax_action');
        sendFormData.append('post_id',elm.value);
        const options = {
            method  : "POST",
            headers : {
                'Accept': 'application/json'
            },
            body    : sendFormData
        };
        fetch(window.ajaxurl,options)
            .then((response)=>{
                if (!response.ok) {
                    throw new Error();
                }
                return response.json();
            })
            .then((json)=>{
                console.log(json);
            })
            .catch(console.error);
    }
}
window.addEventListener('DOMContentLoaded',(e) => {
    const cfsm = new CFSaveManager();
    cfsm.init();
});

wpテンプレでカスタムフィールドの値を出力する部分

$post_id = get_the_ID();
$cf_preview_id = $post_id;
if(is_preview()){
    $post_status = get_post_status($post_id);
    if($post_status === 'publish'){
        global $wpdb;
        $row = $wpdb->get_row("SELECT p.ID FROM $wpdb->posts AS p WHERE p.post_type = '_cf_preview_id' AND p.post_parent = ${post_id}");
        if (!empty($row)) {
            $cf_preview_id = $row->ID;
        }
    }
}
$value = get_field( "test_text1" ,$cf_preview_id );
echo "cf_preview_id:$cf_preview_id<br>";
echo "<h2>test_text1:".esc_html($value)."</h2>";