EDIT, I am rewriting the question for more clarity.
I have a "profile" model that has a belongs to relationship to a "user" model.
A certain user exists already. Later he creates a profile. The profile controller takes care of creating a new entry, but then needs to update a profile_id field as part of the associated user. I was under the impression that saveAll could take care of all the associations but it is not working?
What is the easiest/CakePHP standard way to do something like this? Thanks!