reservation_1:
  id: 1
  statistic_profile_id: 7
  message:
  created_at: 2012-03-12 11:03:31.651441000 Z
  updated_at: 2012-03-12 11:03:31.651441000 Z
  reservable_id: 2
  reservable_type: Training
  stp_invoice_id:
  nb_reserve_places:

reservation_2:
  id: 2
  statistic_profile_id: 3
  message:
  created_at: 2015-06-10 11:20:01.341130000 Z
  updated_at: 2015-06-10 11:20:01.341130000 Z
  reservable_id: 4
  reservable_type: Machine
  stp_invoice_id:
  nb_reserve_places: