HABTM relations. How to insert?

Hi.
I have a problem :)

I've got a HABTM relation between Users and Groups.

After linking the models together, I'm having trouble understanding
how to create a new row in the Groups table (from the groups
controller) and, automatically, creating a new record in the
groups_users table. For example:

- when a user creates a new group, he should become a member of that
group as well as the administrator of the same. The administrator is a
boolean field present in the groups_users table.

Also:

- how, after having the id of a Group and an User, can I update the
corresponding row in the join table? Updating the administrator field
for example? (assuming I'm executing all of this From the Group
Controller)

Can someone help me?

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