gistfile1.txt

class Site < ActiveRecord::Base
  belongs_to :domain
  # has_one :account, through: :domain # Stack level too deep
end

class Domain < ActiveRecord::Base
  has_one :account, through: :site
  has_one :site
end

class Account < ActiveRecord::Base
  has_many :sites, through: :domains
  has_many :domains
end