has_many_through_example.rb

# in moviegoer.rb:
class Moviegoer
  has_many :reviews
  has_many :movies, :through => :reviews
  # ...other moviegoer model code
end
alice = Moviegoer.find_by_name('Alice')
alice_movies = alice.movies
# MAY work, but a bad idea - see caption:
alice.movies << Movie.find_by_name('Inception') # Don't do this!