datamapper update add remove problem

[eluser]cloude[/eluser]
YO

I have tried a few things i've found
but cant seem to get it to work

i have 2 tables with many to many

asd:
id asd_value
1 str
2 str2

dsa:
id dsa_value
1 rts
2 rts2

asd_dsa:
id asd_id dsa_id


the values in asd and dsa should already be able to exist
and i want to add and remove relations in asd_dsa


i dont want to create a class
Asd_dsa
with var $has_one = array('asd', 'dsa');
while Asd and Dsa
var $has_many = array('asd_dsa');

(was finally allowed to edit the title)