Вам не хватает inverse_of
на вашей Legislator
модели.Я провел быстрый тест (чтобы убедиться, что не было проблемы с Mongoid).Мои модели были такими:
class Bill
include Mongoid::Document
include Mongoid::Timestamps
field :name
belongs_to :sponsor, :class_name => "Legislator"
end
class Legislator
include Mongoid::Document
include Mongoid::Timestamps
field :govtrack_id
has_many :bills, :inverse_of => :sponsor
end
И консольный вывод из теста:
ruby-1.9.2-p180 > Bill.create(:name => "A new bill")
=> #<Bill _id: 4e0822636a4f1d11c1000001, _type: nil, created_at: 2011-06-27 06:25:39 UTC, updated_at: 2011-06-27 06:25:39 UTC, name: "A new bill", sponsor_id: nil>
ruby-1.9.2-p180 > Legislator.create(:govtrack_id => "400123")
=> #<Legislator _id: 4e0822786a4f1d11c1000002, _type: nil, created_at: 2011-06-27 06:26:00 UTC, updated_at: 2011-06-27 06:26:00 UTC, govtrack_id: "400123">
ruby-1.9.2-p180 > l = Legislator.first
ruby-1.9.2-p180 > l.bills << Bill.first
=> [#<Bill _id: 4e0822636a4f1d11c1000001, _type: nil, created_at: 2011-06-27 06:25:39 UTC, updated_at: 2011-06-27 06:26:08 UTC, name: "A new bill", sponsor_id: BSON::ObjectId('4e0822786a4f1d11c1000002')>]
ruby-1.9.2-p180 > l.save!
=> true
ruby-1.9.2-p180 > Bill.first.sponsor.govtrack_id
=> "400123"
ruby-1.9.2-p180 > Legislator.first.bills
=> [#<Bill _id: 4e0822636a4f1d11c1000001, _type: nil, created_at: 2011-06-27 06:25:39 UTC, updated_at: 2011-06-27 06:26:08 UTC, name: "A new bill", sponsor_id: BSON::ObjectId('4e0822786a4f1d11c1000002')>]