How to remove parent section from attachment URL?

Question

I have buddypress installed. All URL goes under BP's URL structure. If an attachment belongs to a document in a group, the URL is:

http://domain.com/groups/group-name/docs/doc-name/attachment-name

I would like to learn how to change the attachment URL to:

http://domain.com/?attachment_id=123

Thanks!

Answer 1

The attachment URL is created in wp-includes/link-template.php in function get_attachment_link(). And there is a filter for you, passing the WordPress URL and the post id for the attachment. You can hook into that filter and return the URL you need:

add_filter( 'attachment_link', 'wpse_56619_unprettify_attachment_url', 10, 2 );

function wpse_56619_unprettify_attachment_url( $link, $id )
{
    return home_url( "/?attachment_id=$id" );
}