Ruby on Rails

Has anyone used this combination before? I am curious how I am going
to enforce my authorization rules beyond the view layer w/r/t
invitations.

Certain groups of users will be able to invite new users, but most
will not. When one group of users makes invitations, that magically
sets the role of the invited user to a particular group, and locks
that invited user into a Practice inherited from the person who
invited them.

Since the Devise Invitable controller lives in a gem, how can I reach
in there and extend it to be aware of these restrictions?

Thanks in advance,

Walter

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