STI?
  http://en.wikipedia.org/wiki/Sexually_transmitted_disease
  http://wiki.rubyonrails.org/rails/pages/singletableinheritance

why don't you just use a role-based authentication system? that way
your users may have many different roles. or do actors have different
attributes than directors?

it clearly depends on what your trying to achieve. the better the
infos you offer, the better the advice you might get.
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