修复您已发布的所有旧帖子，其中仅包含子术语。您只需运行此函数1次，它将为您添加父项。这是为所有的祖先的孩子术语。

Make sure to backup the DB before you run this function.

function fix_terms_parents() {
    /**
     * Create a query that select all the posts in your post type
     */
    $query = new WP_Query(array(\'post_type\' => \'property\', \'posts_per_page\' => -1));
    if ( $query->have_posts() ):
        while ( $query->have_posts() ) : $query->the_post();
            $post_id = get_the_ID();
            /**
             * Get all the terms that set to the post
             */
            $terms = get_the_terms($post_id, \'city-type\');
            foreach($terms as $term) {
                /**
                 * Get the term ancestors and append them
                 */
                $ancestors = get_ancestors($term->term_id, \'city-type\');
                if($ancestors) {
                    $new_terms = wp_set_object_terms($post_id, $ancestors, \'city-type\', true);
                    // the $new_terms variable is array of all the new terms that you set
                }
            }
        endwhile;
        wp_reset_postdata();
    endif;
}

下面是一个设置所有术语祖先的函数。您可以使用从wp_set_object_terms 在旧代码中。

/**
 * @param int $post_id the post id
 * @param string $taxonomy
 * @param array terms ids
 *
 * @return array of the ancestors terms that was append
 */
function set_ancestors_terms($post_id, $taxonomy, $terms) {
    foreach($terms as $term_id) {
        $ancestors = get_ancestors($term_id, $taxonomy);
        if($ancestors) {
            // Append parent terms
            return wp_set_object_terms($post_id, $ancestors, $taxonomy, true);
        }
    }
}

第一个只需运行1次的函数将其放入函数中。php和addadd_action( \'init\', \'fix_terms_parents\', 10); 在它之前太多，无法运行它。在此之后，您可以删除此功能，它仅用于修复旧帖子。

在运行第一个函数之前，请创建DB备份。

您添加到函数中的第二个函数。php，当您设置需要的条件以获得这样的返回并运行函数时，您可以在旧代码中运行它。

$terms_array = wp_set_object_terms($pid, $nhb_type_value, \'city-type\');
set_ancestors_terms($pid, \'city-type\', $terms_array);