自定义插件中自定义帖子类型的用户角色功能

Question

我正在创建一个新闻插件，因为我想要自定义帖子类型的用户功能，我的代码就在这里

function news_blurb_custom_type() { 
$labels = array(
    'name'               =>  'Blurbs',
    'singular_name'      => 'Blurb',
    'menu_name'          => 'Blurbs',
    'name_admin_bar'     =>  'Blurb',
    'add_new'            => 'Add New',
    'add_new_item'       =>  'Add New Blurb', 
    'new_item'           =>  'New Blurb',
    'edit_item'          =>  'Edit Blurb',
    'view_item'          =>  'View Blurb',
    'all_items'          =>  'All Blurbs',
    'search_items'       =>  'Search Blurbs',
    'parent_item_colon'  =>  'Parent Blurbs:',
    'not_found'          => 'No blurbs found.',
    'not_found_in_trash' => 'No blurbs found in Trash.'
);

$args = array(
    'labels'             => $labels,
    'public'             => true,
    'publicly_queryable' => true,
    'show_ui'            => true,
    'show_in_menu'       => false, //<--- HERE
    'query_var'          => true,
    'rewrite'            => array( 'slug' => 'all_news_blurbs' ),
    'capability_type'    => 'blurbs',
    'capabilities'       => array(              

                            'edit_post'              => 'edit_single_blurbs',
                            'read_post'              => 'read_single_blurbs',
                            'delete_post'            => 'delete_single_blurbs',

                            'edit_posts'             => 'edit_blurbs',
                            'edit_others_posts'      => 'edit_others_blurbs',
                            'publish_posts'          => 'publish_blurbs',
                            'read_private_posts'     => 'read_private_blurbs',

                            'delete_posts'           => 'delete_blurbs',
                            'delete_private_posts'   => 'delete_private_blurbs',
                            'delete_published_posts' => 'delete_published_blurbs',
                            'delete_others_posts'    => 'delete_others_blurbs',
                            'edit_published_posts'   => 'edit_published_blurbs',
                            'read_published_posts'   => 'read_published_blurbs',

                        ),
    'map_meta_cap'    => true,
    'has_archive'        => true,
    'hierarchical'       => false,
    'menu_position'      => null,
    'supports'           => array( 'title', 'editor', 'thumbnail')
);

register_post_type( 'all_news_blurbs', $args );
}
add_action( 'init', 'news_blurb_custom_type' );

我的用户角色代码

add_role('post_writer', 'Post writer', array(

//* Meta capabilities
'read'                            => true,
'edit_single_blurbs'              => true,
'read_single_blurbs'              => true,
'delete_single_blurbs'            => true,

//* Primitive capabilities used outside of map_meta_cap()
'edit_blurbs'             => true,
'edit_others_blurbs'      => true,
'publish_blurbs'          => true,
'read_private_blurbs'     => true,

//* Primitive capabilities used within of map_meta_cap()

'delete_blurbs'           => true,
'delete_private_blurbs'   => true,
'delete_published_blurbs' => true,
'delete_others_blurbs'    => true,
'edit_private_blurbs'     => true,
'edit_published_blurbs'   => true,
'read_published_blurbs' =>  true

));


function add_circular_caps() {

$roles = get_role( 'post_writer' );

$roles ->add_cap( 'edit_single_blurbs' ); 
$roles ->add_cap( 'read_single_blurbs' ); 
$roles ->add_cap( 'delete_single_blurbs' ); 
$roles ->add_cap( 'edit_blurbs' ); 
$roles ->add_cap( 'edit_others_blurbs' ); 
$roles ->add_cap( 'publish_blurbs' ); 
$roles ->add_cap( 'read_private_blurbs' ); 
$roles ->add_cap( 'delete_blurbs' ); 
$roles ->add_cap( 'delete_private_blurbs' ); 
$roles ->add_cap( 'delete_published_blurbs' ); 
$roles ->add_cap( 'delete_others_blurbs' ); 
$roles ->add_cap( 'edit_published_blurbs' ); 
$roles ->add_cap( 'read_published_blurbs' ); 

}
add_action( 'admin_init', 'add_circular_caps');

当我以帖子编写者身份登录时，自定义帖子类型未显示

我已经改变了所有相似之处仍然没有用，但我在主题函数中使用它。用户角色显示但是对于插件它没有显示。