Добавление колонок к кастомным постам (произвольные поля и миниатюра)

Добавление колонок

/*  Подключаем и изменяем колонки в админке
/* ------------------------------------ */	
function art_get_featured_image($post_ID) {  
	
    $post_thumbnail_id = get_post_thumbnail_id($post_ID);  
    if ($post_thumbnail_id) {  
        $post_thumbnail_img = wp_get_attachment_image_src($post_thumbnail_id, 'thumbnail');  
        return $post_thumbnail_img[0];  
    }  
} 

function art_service_add_columns($my_columns){
	unset($my_columns['date']);
	$add_columns = array(
		'price_service' => 'Цена',
		'time_service' => 'Время',
		'thumb_service' => 'Миниатюра',
		);
	$my_columns = array_slice( $my_columns, 0, 2, true ) + $add_columns + array_slice( $my_columns, 2, NULL, true );
	return $my_columns;
}
function art_service_fill_post_columns( $column ) {
	global $post;
	switch ( $column ) {
		case 'price_service':
			echo 'от '. get_post_meta( $post->ID, 'service_price', true ).'&#8381';
		break;
	}
	switch ( $column ) {
		case 'time_service':
			echo 'от '. get_post_meta( $post->ID, 'service_time', true ).'ч.';
			break;
	}
	switch ( $column ) {
		case 'thumb_service':
			global $post;
			$post_ID = $post-> ID;
			$post_featured_image = art_get_featured_image($post_ID);  
			if ($post_featured_image) {  
				echo '<img width="100" src="' . $post_featured_image . '" />';  
			} 
			break;
	}
}
add_filter( 'manage_edit-artabr-service_columns', 'art_service_add_columns', 10, 1 );
add_action( 'manage_posts_custom_column', 'art_service_fill_post_columns', 10, 1 );