如何使定制帖子类型对订阅者不可见

我正在尝试使用户角色的自定义帖子类型不可见subscriber. 我该怎么做？

我尝试了以下方法，但似乎不起作用。我的帖子类型为request.

$role = get_role( \'subscriber );

$role->remove_cap( \'read\' );
$role->remove_cap( \'read_request\' );
$role->remove_cap( \'read_private_requests\' );
$role->remove_cap( \'edit_request\' );
$role->remove_cap( \'edit_requests\' );
$role->remove_cap( \'edit_others_requests\' );
$role->remove_cap( \'edit_published_requests\' );
$role->remove_cap( \'publish_requests\' );
$role->remove_cap( \'delete_others_requests\' );
$role->remove_cap( \'delete_private_requests\' );
$role->remove_cap( \'delete_published_requests\' );

我想这可能会满足我的要求，但事实并非如此。有什么想法吗？

这是我自定义帖子类型的一部分：

  register_post_type( \'antrag\', array(

        \'labels\'              => array(
            ...
        ),
        \'public\'              => true,
        \'publicly_queryable\'  => true,
        \'exclude_from_search\' => true,
        \'show_ui\'             => true,
        \'show_in_menu\'        => true,
        \'query_var\'           => true,
        \'rewrite\'             => true,
        \'menu_position\'       => 10,
//          \'capability_type\'     => \'post\',
        \'has_archive\'         => true,
        \'menu_icon\'           => \'dashicons-welcome-write-blog\',
        \'hierarchical\'        => false,
        \'supports\'            => array( \'title\', \'editor\', \'author\', \'thumbnail\', \'comments\', \'excerpt\', \'custom-fields\', \'revisions\' ),
        \'capability_type\'     => array( \'request\', \'requests\' ),
        \'map_meta_cap\'        => true,

    )
);

\'capabilities\' => array( \'edit_post\' => \'update_core\', \'read_post\' => \'update_core\', \'delete_post\' => \'update_core\', \'edit_posts\' => \'update_core\', \'edit_others_posts\' => \'update_core\', \'delete_posts\' => \'update_core\', \'publish_posts\' => \'update_core\', \'read_private_posts\' => \'update_core\'

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