--- 
example: 
  created_on: 2007-03-23 12:54:18 +01:00
  tweek: 12
  tmonth: 3
  project_id: 1
  comments: My hours
  updated_on: 2007-03-23 12:54:18 +01:00
  activity_id: 9
  spent_on: <%= Time.now %>
  issue_id: 1
  id: 1
  hours: 1.0
  user_id: 1
  tyear: 2007
  rate_id: 4
  costs: 0.0

default_example: 
  created_on: 2007-03-23 12:54:18 +01:00
  tweek: 12
  tmonth: 3
  project_id: 1
  comments: My hours
  updated_on: 2007-03-23 12:54:18 +01:00
  activity_id: 9
  spent_on: <%= Time.now %>
  issue_id: 1
  id: 2
  hours: 1.0
  user_id: 2
  tyear: 2007
  rate_id: 7
  costs: 0.0