我有一个自定义的帖子类型“placement”，带有一个自定义字段“position”。我想做的是，在placements archive页面上，按“position”值对结果进行排序。

我有以下URL重写规则：

$newRules[\'placements/?$\'] = \'index.php?post_type=placement&meta_key=position&orderby=meta_value&order=DESC\';

以下是如何定义我的自定义帖子类型：

    function custom_post_type_placement() {

    $labels = array(
        \'name\'                => _x( \'Placements\', \'Post Type General Name\', \'text_domain\' ),
        \'singular_name\'       => _x( \'Placement\', \'Post Type Singular Name\', \'text_domain\' ),
        \'menu_name\'           => __( \'Placement\', \'text_domain\' ),
        \'name_admin_bar\'      => __( \'Placement\', \'text_domain\' ),
        \'parent_item_colon\'   => __( \'Parent Placement:\', \'text_domain\' ),
        \'all_items\'           => __( \'All Placements\', \'text_domain\' ),
        \'add_new_item\'        => __( \'Add New Placement\', \'text_domain\' ),
        \'add_new\'             => __( \'Add New\', \'text_domain\' ),
        \'new_item\'            => __( \'New Placement\', \'text_domain\' ),
        \'edit_item\'           => __( \'Edit Placement\', \'text_domain\' ),
        \'update_item\'         => __( \'Update Placement\', \'text_domain\' ),
        \'view_item\'           => __( \'View Placement\', \'text_domain\' ),
        \'search_items\'        => __( \'Search Placement\', \'text_domain\' ),
        \'not_found\'           => __( \'Not found\', \'text_domain\' ),
        \'not_found_in_trash\'  => __( \'Not found in Trash\', \'text_domain\' ),
    );
    $args = array(
        \'label\'               => __( \'Placement\', \'text_domain\' ),
        \'description\'         => __( \'Placements\', \'text_domain\' ),
        \'labels\'              => $labels,
        \'supports\'            => array( \'title\', \'editor\', ),
        \'taxonomies\'          => array( \'journal_placement\' ),
        \'hierarchical\'        => false,
        \'public\'              => true,
        \'show_ui\'             => true,
        \'show_in_menu\'        => true,
        \'menu_position\'       => 5,
        \'show_in_admin_bar\'   => true,
        \'show_in_nav_menus\'   => true,
        \'can_export\'          => true,
        \'has_archive\'         => true,      
        \'exclude_from_search\' => false,
        \'publicly_queryable\'  => true,
        \'capability_type\'     => \'page\',
    );
    register_post_type( \'placement\', $args );
add_action( \'init\', \'custom_post_type_placement\', 0 );

我能够正确地切换ASC和DESC，但我的结果仍按发布日期排序。

以下是查询的内容：

SELECT SQL_CALC_FOUND_ROWS fetr_posts.ID FROM fetr_posts WHERE 1=1 AND fetr_posts.post_type = \'placement\' AND (fetr_posts.post_status = \'publish\' OR fetr_posts.post_status = \'private\') ORDER BY fetr_posts.post_date DESC LIMIT 0, 10

似乎没有考虑meta\\u键和orderby参数。你知道为什么以及如何使用重写规则对结果进行正确排序吗？

编辑：多亏了米洛的回答，我按以下方式更改了代码，现在可以正常工作了。

我完全删除了重写规则，并将我的自定义帖子定义如下：

function custom_post_type_placement() {

    $labels = array(
        \'name\'                => _x( \'Placements\', \'Post Type General Name\', \'text_domain\' ),
        \'singular_name\'       => _x( \'Placement\', \'Post Type Singular Name\', \'text_domain\' ),
        \'menu_name\'           => __( \'Placement\', \'text_domain\' ),
        \'name_admin_bar\'      => __( \'Placement\', \'text_domain\' ),
        \'parent_item_colon\'   => __( \'Parent Placement:\', \'text_domain\' ),
        \'all_items\'           => __( \'All Placements\', \'text_domain\' ),
        \'add_new_item\'        => __( \'Add New Placement\', \'text_domain\' ),
        \'add_new\'             => __( \'Add New\', \'text_domain\' ),
        \'new_item\'            => __( \'New Placement\', \'text_domain\' ),
        \'edit_item\'           => __( \'Edit Placement\', \'text_domain\' ),
        \'update_item\'         => __( \'Update Placement\', \'text_domain\' ),
        \'view_item\'           => __( \'View Placement\', \'text_domain\' ),
        \'search_items\'        => __( \'Search Placement\', \'text_domain\' ),
        \'not_found\'           => __( \'Not found\', \'text_domain\' ),
        \'not_found_in_trash\'  => __( \'Not found in Trash\', \'text_domain\' ),
    );
    $rewrite = array(
        \'slug\'                => \'placements\',
        \'with_front\'          => false,
        \'pages\'               => true,
        \'feeds\'               => false,
    );
    $args = array(
        \'label\'               => __( \'Placement\', \'text_domain\' ),
        \'description\'         => __( \'Placements\', \'text_domain\' ),
        \'labels\'              => $labels,
        \'supports\'            => array( \'title\', \'editor\', ),
        \'taxonomies\'          => array( \'journal_placement\' ),
        \'hierarchical\'        => false,
        \'public\'              => true,
        \'show_ui\'             => true,
        \'show_in_menu\'        => true,
        \'menu_position\'       => 5,
        \'show_in_admin_bar\'   => true,
        \'show_in_nav_menus\'   => true,
        \'can_export\'          => true,
        \'has_archive\'         => true,      
        \'exclude_from_search\' => false,
        \'publicly_queryable\'  => true,
        \'rewrite\'             => $rewrite,
        \'capability_type\'     => \'page\',
    );
    register_post_type( \'placement\', $args );

}
add_action( \'init\', \'custom_post_type_placement\', 0 );

我还添加了此功能：

function order_by_position($query){

    if(is_post_type_archive( \'placement\' )){
        $query->query_vars[\'meta_key\']="position";
        $query->query_vars[\'orderby\']="meta_value_num";
    }
    return $query;
}

add_action( \'pre_get_posts\', \'order_by_position\' );