category_1:
  id: 1
  name: Stage
  created_at: 2016-04-04 14:11:34.544995000 Z
  updated_at: 2016-04-04 14:11:34.544995000 Z

category_2:
  id: 2
  name: Atelier
  created_at: 2016-04-04 14:11:34.547621000 Z
  updated_at: 2016-04-04 14:11:34.547621000 Z