How about a little trick. Make Id column of the table a string and
then:
class Friendship < ActiveRecord::Base
belongs_to :sender, ...
belongs_to :requester, ...
before_validation :standarize_id, :on => :create
validates_uniqueness_of :id
def standarize_id
self.id = [sender.id, requester.id].sort.join(",")
end
end
This way we don't forget the information about whose is the sender and
who is requester. Instead we relay on standarized unique id for the
the couple.
Robert Pankowecki
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