我正在使用save\\u post操作以自定义post类型保存一些元数据：

function my_save_post($post_id) {
    // is autosave?
    if(defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE) {
        return $post_id;
    }

    // verify nonce
    if ( !wp_verify_nonce( $_POST[\'metabox_nonce\'], basename(__FILE__) )) {
        return $post_id;
    }

    if (\'book\' == $_POST[\'post_type\']) {
        $post_parent = intval($_POST[\'post_parent\']);
        $author = $_POST[\'author\'];
        $price = intval($_POST[\'price\']);
        update_post_meta($post_id, \'author\', $author);
        update_post_meta($post_id, \'price\', $price);

        //TODO: add function to update the post_parent field
    }
}

我的问题是，如何修改自定义帖子类型的post\\u父字段？据我所知，我不能使用update\\u post\\u meta（）函数，因为post\\u父字段不是meta字段。我说得对吗？

任何帮助都将不胜感激

function wpa_insert_post( $data , $postarr ){ 
    //do something with $data[\'post_parent\']
    return $data;
}
add_filter( \'wp_insert_post_data\' , \'wpa_insert_post\' , \'99\', 2 );

function wpa_insert_post( $data , $postarr ){ 
    //do something with $data[\'post_parent\']
    $data[\'post_parent\'] = intval($postarr[\'post_parent\']);

    //update meta data
    update_post_meta($postarr[\'ID\'], \'author\', $postarr[\'author\']);
    update_post_meta($postarr[\'ID\'], \'price\', $postarr[\'price\']);

    return $data;
}
add_filter( \'wp_insert_post_data\' , \'wpa_insert_post\' , \'99\', 2 );

$wpdb->query( \'update \'.$wpdb->prefix.\'posts set post_parent=\'.$post_parent.\' where ID=\'.$post_id );

  $bookUpdate = array();
  $bookUpdate[\'ID\'] = $post_id;
  $bookUpdate[\'post_parent\'] = $post_parent;

  wp_update_post( $bookUpdate );