[web2py] dropdownlist sort, orderby..

[Mchurch]

I have some  tables, one is :
db.define_table('category',
    Field('language_id', db.language),
    Field('is_menu','boolean', default=False),
    Field('name'),
    Field('text'),
    Field('order','integer'), format=lambda r: r.name +"/"+
r.language_id.language)

Using the appadmin/insert/db/ , i can see the dropdownlist with the
format result , but i would like to sort it by the same format result
(not by !id ).
Help and many thanks!