在我看来，既然“孵化器”是对“初创公司”进行分组的一种方式，“孵化器”应该是“初创公司”自定义帖子类型的分类法。在注册分类法时，请确保指定两者之间的链接。

register_taxonomy( \'Incubator\', array( \'startup\' ), $args );

您可以通过输入数据和自定义模板分类孵化器来输入详细信息来描述孵化器。php（参见template hierarchy schema 了解何时加载哪个模板）。

如果您需要输入有关孵化器的更多信息，可以使用插件（如果您只需要分类图像WPCustom Category Image 插件已经足够了，否则请看WP Types 或ACF).

使用分类法的另一种方法是使用两种不同的岗位类型——孵化器和孵化器。我们可以通过在孩子的帖子元数据中保存家长的帖子ID，将孵化帖子与其家长孵化器关联起来。

步骤1-注册帖子类型

有关详细信息，请参阅代码注释。

// add parent and child post types
// set desired slugs using placeholder
add_action( \'init\', \'wpd_post_types\' );
function wpd_post_types() {
    // add the parent slug placeholder rewrite tag
    add_rewrite_tag( \'%wpd_parent_slug%\', \'([^&]+)\' );

    // arguments for Incubators (parent)
    // slug and archive are both just \'incubators\'
    // feed and page rewrites disabled
    $parent_args = array(
        \'public\' => true,
        \'label\'  => \'Incubators\',
        \'rewrite\' => array(
            \'slug\' => \'incubators\',
            \'with_front\' => false,
            \'feeds\' => false,
            \'pages\' => false
        ),
        \'has_archive\' => \'incubators\'
    );
    register_post_type( \'incubators\', $parent_args );

    // arguments for Incubated (child)
    // slug contains parent slug placeholder
    // no archive for Incubated, the parent posts serve as their archive
    $child_args = array(
        \'public\' => true,
        \'label\'  => \'Incubated Startups\',
        \'rewrite\' => array(
            \'slug\' => \'incubators/%wpd_parent_slug%\',
            \'with_front\' => false,
            \'feeds\' => false,
            \'pages\' => false
        ),
        \'has_archive\' => false
    );
    register_post_type( \'incubated\', $child_args );
}

第二步-哎呀，有些东西坏了为这些帖子类型生成的重写规则有问题-父附件规则步在子帖子规则上。有两种方法可以解决这个问题——一种方法是挂接查询解析，检查它是否匹配那些附件请求，如果这是它的目的，则将它们重置为子post请求。另一个更简单的方法是摆脱这些规则，因为也许你不需要它们。如果需要，可以插入备用规则以支持附件。

// filter the array of all rewrite rules
// remove any that contain the parent post type and attachment
add_filter( \'rewrite_rules_array\', \'wpd_remove_attachment_rewrites\' );
function wpd_remove_attachment_rewrites( $rules ){
    foreach ( $rules as $rule => $rewrite ) {       
        if( strpos( $rewrite, \'attachment\' ) !== false
            && strpos( $rule, \'incubators\' ) !== false ) {
            unset( $rules[$rule] );
        }
    }
    return $rules;
}

第3步-过滤孵化（子）帖子的permalink输出每当API输出permalink时，子帖子需要在URL中包含其父帖子的slug，让我们来实现这一点。

// filter post_type_link for child posts
// swap real parent slug for parent slug placeholder
add_filter( \'post_type_link\', \'wpd_cpt_permalinks\', 1, 2 );
function wpd_cpt_permalinks( $post_link, $post ){
    // if this is an Incubated post
    if ( is_object( $post ) && $post->post_type == \'incubated\' ){
        // get the parent ID saved in post meta
        // and swap that post\'s slug for the placeholder tag
        $parent_id = get_post_meta( $post->ID, \'_wpd_parent_id\', true );
        $parent_slug = \'no-parent\';
        if( \'\' != $parent_id ){
            $parent_slug = basename( get_permalink( $parent_id ) );
        }
        $post_link = str_replace( \'%wpd_parent_slug%\' , $parent_slug , $post_link );
    }
    return $post_link;
}

警告此实现中没有任何内容在子post permalinks中强制执行有效的父slug值。实际上，我认为这不是一个问题。如果您认为是这样，那么可以通过挂接到查询解析/查询的某个阶段，并检查父slug是否有效以及是否是所查询帖子的父slug，然后强制执行404。

步骤4-在孵化（子）帖子中添加一个元框，用于选择父项

生成一个简单的选择列表，其中包含所有孵化器（父）帖子的名称和ID。将所选值保存在键下的孵化（子）post meta中_wpd_parent_id.

// Add the meta box
add_action( \'add_meta_boxes\', \'wpd_parent_metabox\' );
function wpd_parent_metabox(){
    add_meta_box(
        \'wpd_parent_metabox\',
        \'Parent Incubator\',
        \'wpd_parent_metabox_callback\',
        \'incubated\',
        \'side\'
    );
}

// render the meta box
function wpd_parent_metabox_callback( $post, $metabox ) {

    // load the parent ID if it already exists
    $parent_id = get_post_meta( $post->ID, \'_wpd_parent_id\', true );

    // add a nonce
    echo \'<input type="hidden" name="wpd_parent_metabox_nonce" value="\' . wp_create_nonce( \'wpd_parent_metabox_nonce\' ) . \'" />\';

    // get all the Incabator (parent) posts and make a list of IDs / names
    // check previously saved value against each item\'s value
    echo \'<select name="wpd_parent_id">\';
    echo \'<option value="" \' . selected( $parent_id, \'\' ) . \'>None</option>\';

    $parents = new WP_Query(
        array(
            \'post_type\' => \'incubators\',
            \'posts_per_page\' => -1
        )
    );
    if( $parents->have_posts() ){
        foreach( $parents->posts as $parent ){
            echo \'<option value="\' . $parent->ID . \'" \' . selected( $parent_id, $parent->ID ) . \'>\' . $parent->post_title . \'</option>\';
        }
    }
    echo \'</select>\';

}


// save meta box data
add_action( \'save_post\', \'wpd_parent_metabox_save\', 1, 2 );
function wpd_parent_metabox_save( $post_id, $post ) {

    // don\'t save if autosave, user doesn\'t have permission, or a revision
    if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return;

    if ( !current_user_can( \'edit_post\', $post_id )) return;

    if( \'revision\' == $post->post_type ) return;

    // check nonce
    if( isset( $_POST[\'wpd_parent_metabox_nonce\'] )
        && wp_verify_nonce( $_POST[\'wpd_parent_metabox_nonce\'], \'wpd_parent_metabox_nonce\' ) ){

        // save value or remove if none was selected
        if( isset( $_POST[\'wpd_parent_id\'] )
            && \'\' != $_POST[\'wpd_parent_id\'] ){
            update_post_meta( $post_id, \'_wpd_parent_id\', $_POST[\'wpd_parent_id\'] );
        } else {
            delete_post_meta( $post_id, \'_wpd_parent_id\' );
        }

    }
}

好的，到目前为止，我们有我们的帖子类型和一种将孩子与父母联系起来的方法。我们可以创建每种类型的帖子和链接。

步骤5-过滤器the_content 并插入指向父级/子级的链接

这将显示如何查询子帖子或父帖子。家长将显示孩子的列表，孩子将显示指向家长的链接。

// add links to post content
add_filter( \'the_content\', \'wpd_child_post_links_in_parent_content\' );
function wpd_child_post_links_in_parent_content( $content ){

    // if this is one of our two post types
    if ( is_singular( array( \'incubators\', \'incubated\' ) ) ){

        $args = array();
        // set query args depending on what type this is
        if( \'incubators\' == get_post_type() ){
            // meta query for any incubated posts (children) with this incubator ID
            $args = array(
                \'post_type\' => \'incubated\',
                \'posts_per_page\' => -1,
                \'meta_query\' => array(
                    array(
                        \'key\' => \'_wpd_parent_id\',
                        \'value\' => get_the_ID()
                    )
                )
            );
        // this is a child post, check if it has a parent
        } elseif( $parent_id = get_post_meta( get_the_ID(), \'_wpd_parent_id\', true ) ){
            // get the single parent from the ID stored in post meta
            $args = array(
                \'post_type\' => \'incubators\',
                \'posts_per_page\' => 1,
                \'p\' => $parent_id
            );
        }

        if( !empty( $args ) ){
            // query and output the list if any posts were returned
            $related = new WP_Query( $args );
            if( $related->have_posts() ){
                $content .= \'<ul>\';
                foreach( $related->posts as $related_post ){
                    $content .= \'<li><a href="\' . get_permalink( $related_post ) . \'">\' . $related_post->post_title . \'</a></li>\';
                }
                $content .= \'</ul>\';
            }
        }

    }
    return $content;
}