向媒体库查询中添加分组依据的正确方法是什么？到目前为止，我所累的还没有发挥作用：

add_filter(\'posts_groupby \', \'limitMediaLibraryItems\', 10, 2 );
function limitMediaLibraryItems($groupby) {

    if ( strpos( $_SERVER[ \'REQUEST_URI\' ], \'/wp-admin/upload.php\' ) !== false ) {    
        $groupby .= " guid";
    }

    return $groupby;
}

更新：也许正确的方法是使用ajax\\u query\\u attachments\\u args过滤器。这是如何实现的？

add_filter( \'ajax_query_attachments_args\', \'hide_duplicate_guids\', 10, 1 );

function hide_duplicate_guids( $query = array() ) {

    $query[\'group by\'] = \'guid\';

    return $query;

}

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

function modify_attachments( $query ) {
    if ( is_admin() && strpos( $_SERVER[ \'REQUEST_URI\' ], \'admin-ajax.php\' ) !== false ) {      
        add_filter( \'posts_groupby\', \'group_attachments\' );
    }
 return $query;
}

function group_attachments( $groupby ) {  
    $groupby .= " guid";
    return $groupby;        
}