association1.rb

# it would be nice if we could do this:
inception = Movie.find_by_title('Inception')
alice = Moviegoer.find_by_username('alice')
bob =   Moviegoer.find_by_username('bob')
# add reviews of Inception from figure
alice_review_inception = Review.new(:potatoes => 5)
bob_review_inception   = Review.new(:potatoes => 3)
# the one-to-many association from movies to reviews:
inception.reviews = [alice_review_inception, bob_review_inception]
inception.save!
# and from moviegoers to reviews:
alice.reviews = [alice_review_inception]
alice.save!
bob.reviews  =  [bob_review_inception]
bob.save!
# can we find out who wrote a review?
bob_review_inception.moviegoer  # => bob