[Rails] basic routing question with HABTM

Hi, Rails newbie here.

If I have a basic HABTM association - say, users and groups - I can't
get my head around the RESTful routing required to add a user to a
group.

POST /user will call user#create
POST /group will call group#create
POST /group/:group_id/user should call: what? Is it ok to define
a "addUser" action to the group controller? Or should I test for the
existence of the group_id in the user#create method and then proceed
accordingly? I want to do things the Rails way but sometimes my PHP
experience comes back to haunt me. :)

Thanks,

Stan

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