Forum: Ruby on Rails compose_primary_keys

I´m looking for a way to work with compose primary keys.
I alredy know that plugin http://compositekeys.rubyforge.org/
but it doesn´t have examples.

Please help =]

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Horus Augustus C. C. Lima

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Augustus Costa wrote:
> I´m looking for a way to work with compose primary keys.
> I alredy know that plugin http://compositekeys.rubyforge.org/
> but it doesn´t have examples.
What do you mean it doesn't have examples? What is this:

class Membership < ActiveRecord::Base
  # set_primary_keys *keys - turns on composite key functionality
  set_primary_keys :user_id, :group_id
  belongs_to :user
  belongs_to :group
  has_many :statuses, :class_name => 'MembershipStatus', :foreign_key => 
[:user_id, :group_id]
end

there's a Google group "Composite Keys for ActiveRecord" that you
might look at for tips