update related model data

hello,
I have two tables "users" and "user_profiles", which are related .
there's no problem to add new data to this tables, but I don't know
how to edit/update this data. when I use $this->User->saveAll($this-
>data), it updates users table, but in the user_profiles it add a new
entry instead of update current entry. have someone a solution?
thanks

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