rails--rails/activerecord/test/fixtures/companies.yml

first_client:
  id: 2
  type: Client
  firm_id: 1
  client_of: 2
  name: Summit
  ruby_type: Client

first_firm:
  id: 1
  type: Firm
  name: 37signals
  ruby_type: Firm

second_client:
  id: 3
  type: Client
  firm_id: 1
  client_of: 1
  name: Microsoft
  ruby_type: Client