Composite primary keys in ruby on rails

Question

I am trying to use http://compositekeys.rubyforge.org/ in order to have composite primary keys in my activerecord models.

I already added gem 'composite_primary_keys', '=3.1.0' to my Gemfile. Now I am trying to setup my first modelclass as follows.

class StringProperty < ActiveRecord::Base
    self.primary_keys :entity_id, :property_id
    set_table_name "problem.string_property"
    attr_accessible :entity_id, :property_id, :value
end

But all I get is:

What am I doing wrong? :(

Answer 1

The following will work I think.

require 'composite_primary_keys'
class StringProperty < ActiveRecord::Base
    self.primary_keys = :entity_id, :property_id
    set_table_name "problem.string_property"
    attr_accessible :entity_id, :property_id, :value
end