我已经创建了父>子>孙结构。（课程>系列>剧集）。
我已经创建了下面的代码来更新每个自定义帖子类型的url，这样我就可以拥有url结构
http://mywebsite.co.uk/system/%course%/%series%/%episode%.
例如，一门名为“速成课程”的课程，包含一系列“基础知识”，其中一集是“检查镜子”，应该是这样的
http://mywebsite.co.uk/system/crash-course/the-basics/checking-your-mirrors
一切正常，但我注意到一个非常奇怪的bug。每隔一次我保存一集，permalink就会改变自己，尝试匹配一个随机的系列？
例如，如果我保存一次该集，我的永久链接是
http://mywebsite.co.uk/system/crash-course/the-basics/checking-your-mirrors.
然后，只要我回到这一集，进行任何更改并再次尝试保存，一旦保存并刷新页面，它就会将自身更改为
http://mywebsite.co.uk/system/crash-course/the-basics/the-basics-2, 我必须单击“编辑”并手动将其更改回来。
我的完整自定义帖子类型注册码如下，如果有人有任何想法，请告诉我！每隔一次我进行更改时，手动将永久链接更改回原来的位置，这并不理想！
Note - My apologies for the huge code snippet below, i thought it would be best if I pasted ALL of my custom post type code in to help debug!
<?php
/* ----------------------------------------------------------------------------------------------------------
Register our custom post types
---------------------------------------------------------------------------------------------------------- */
function create_post_type() {
//Courses
register_post_type( \'course\',
[
\'labels\' => array(
\'name\' => __( \'Courses\' ),
\'singular_name\' => __( \'Course\' )
),
\'description\' => \'All courses\',
\'public\' => true,
\'hierarchical\' => true,
\'rewrite\' => array(
\'slug\' => \'system\',
),
\'menu_icon\' => \'dashicons-welcome-learn-more\',
\'supports\' => [\'title\', \'custom_fields\', \'page-attributes\']
]
);
//Series
register_post_type( \'series\',
[
\'labels\' => array(
\'name\' => __( \'Series\' ),
\'singular_name\' => __( \'Series\' )
),
\'description\' => \'Course Series\',
\'public\' => true,
\'hierarchical\' => false,
\'show_ui\' => true,
\'show_in_menu\' => \'edit.php?post_type=course\',
\'supports\' => [\'title\', \'custom_fields\', \'page-attributes\']
]
);
//Episodes
register_post_type( \'episodes\',
[
\'labels\' => array(
\'name\' => __( \'Episodes\' ),
\'singular_name\' => __( \'Episode\' )
),
\'description\' => \'Series Episodes\',
\'public\' => true,
\'hierarchical\' => false,
\'show_ui\' => true,
\'show_in_menu\' => \'edit.php?post_type=course\',
\'supports\' => [\'title\', \'custom_fields\', \'page-attributes\']
]
);
}
add_action( \'init\', \'create_post_type\' );
/* ----------------------------------------------------------------------------------------------------------
Add our meta boxes to our series and episode add/edit page
---------------------------------------------------------------------------------------------------------- */
function my_add_meta_boxes() {
//Series Meta Boxes
add_meta_box( \'series-parent\', \'Course\', \'series_attributes_meta_box\', \'series\', \'side\', \'high\' );
//Episode Meta Boxes
add_meta_box( \'episode-parent\', \'Series\', \'episode_attributes_meta_box\', \'episodes\', \'side\', \'high\' );
}
add_action( \'add_meta_boxes\', \'my_add_meta_boxes\' );
function series_attributes_meta_box($post) {
$post_type_object = get_post_type_object($post->post_type);
$pages = wp_dropdown_pages([
\'post_type\' => \'course\',
\'selected\' => $post->post_parent,
\'name\' => \'parent_id\',
\'show_option_none\' => __( \'(no parent)\' ),
\'sort_column\'=> \'menu_order, post_title\',
\'echo\' => 0
]);
if (!empty($pages)){
echo $pages;
}
}
function episode_attributes_meta_box( $post ) {
$post_type_object = get_post_type_object( $post->post_type );
$select = "<select name=\'parent_id\' id=\'parent_id\'>";
$select .= "<option value=\'\'>(No Parent)</option>";
//Get Series
$args = [
\'post_type\' => \'series\',
\'posts_per_page\' => -1,
\'meta_key\' => \'series_number\',
\'orderby\' => \'meta_value_num\',
\'order\' => \'ASC\'
];
$seriesQuery = new WP_Query($args);
//Loop the series
while($seriesQuery->have_posts()){
$seriesQuery->the_post();
$select .= "<option " . (get_the_ID() == $post->post_parent ? \'selected\' : \'\') . " class=\'level-0\' value=\'" . get_the_ID() . "\'>" . get_the_title(wp_get_post_parent_id(get_the_ID())) . \' - \' . get_the_title() . "</option>";
}
wp_reset_postdata();
$select .= "</select>";
echo $select;
}
/* ----------------------------------------------------------------------------------------------------------
String replace on the permalinks before we save them
---------------------------------------------------------------------------------------------------------- */
function custom_permalinks($permalink, $post, $leavename) {
$post_id = $post->ID;
$parent = $post->post_parent;
$parent_post = get_post( $parent );
//Series or Episodes
switch($post->post_type){
case \'episodes\':
if(empty($permalink) || in_array($post->post_status, array(\'draft\', \'pending\', \'auto-draft\'))){
return $permalink;
} else {
$grandparent_post = get_post( $parent_post->post_parent );
$search = [\'%course%\', \'%series%\'];
$replace = [$grandparent_post->post_name, $parent_post->post_name];
$permalink = str_replace($search, $replace, $permalink);
return $permalink;
}
break;
case \'series\':
if(empty($permalink) || in_array($post->post_status, array(\'draft\', \'pending\', \'auto-draft\'))){
return $permalink;
} else {
$search = [\'%course%\'];
$replace = [$parent_post->post_name];
$permalink = str_replace($search, $replace, $permalink);
return $permalink;
}
break;
default:
return $permalink;
break;
}
}
add_filter(\'post_type_link\', \'custom_permalinks\', 10, 3);
function my_add_rewrite_rules() {
//Episodes
add_permastruct(\'episodes\', \'/system/%course%/%series%/%episodes%\', false, [\'walk_dirs\' => false]);
add_rewrite_tag(\'%episodes%\', \'([^/]+)\', \'episodes=\');
add_rewrite_rule(\'^system/([^/]+)/([^/]+)/([^/]+)?\',\'index.php?episodes=$matches[3]\',\'top\');
//Series
add_permastruct(\'series\', \'/system/%course%/%series%\', false, [\'walk_dirs\' => false]);
add_rewrite_tag(\'%series%\', \'([^/]+)\', \'series=\');
add_rewrite_rule(\'^system/([^/]+)/([^/]+)/?\',\'index.php?series=$matches[2]\',\'top\');
}
add_action( \'init\', \'my_add_rewrite_rules\' );
?>
