Acessar atributos de objetos usados como Join Tables em relacionamentos N x N (many to many)

many-to-many.rb

# Schema usado nos testes
#
#ActiveRecord::Schema.define(:version => 20120817041434) do
#
#  create_table "budgets", :force => true do |t|
#    t.string   "name"
#    t.datetime "created_at", :null => false
#    t.datetime "updated_at", :null => false
#  end
#
#  create_table "providers", :force => true do |t|
#    t.string   "name"
#    t.datetime "created_at", :null => false
#    t.datetime "updated_at", :null => false
#  end
#
#  create_table "solicitations", :force => true do |t|
#    t.string   "visualized"
#    t.integer  "provider_id"
#    t.integer  "budget_id"
#    t.datetime "created_at",  :null => false
#    t.datetime "updated_at",  :null => false
#  end
#end

class Budget < ActiveRecord::Base
	has_many :solicitations
	has_many :providers, :through => :solicitations
end

class Solicitation < ActiveRecord::Base
	belongs_to :budget
	belongs_to :provider
end

class Provider < ActiveRecord::Base
	has_many :solicitations
	has_many :budgets, :through => :solicitations
end

p = Provider.new
p.budget_ids = [1]

orcamento_um = p.budgets[0]

# Acessando dados de um objeto usado como JoinTable
orcamento_um.solicitations[0].visualized?