[{
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  "user_id": "538b7c95c883570700ee9744",
  "date": "2013-11-18T09:04:24.447Z",
  "object": {
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    "date": "2013-11-18T09:04:24.447Z"
  },
  "arrayOfIds": ["538b7c95c883570700ee9644", "538b7c95c883570700ee9645"],
  "arrayOfDates": ["2013-11-18T09:04:24.447Z", "2013-11-19T09:04:24.447Z"],
  "arrayOfObjects": [{
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  }, {
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    "date": "2013-11-19T09:04:24.447Z"
  }],

  "cost": 100,
  "seq": 1000
}, {
  "_id": "538b7c95c883570700ee9646",
  "user_id": "538b7c95c883570700ee9744",
  "date": "2013-11-20T09:04:24.447Z",
  "object": {
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    "date": "2013-11-20T09:04:24.447Z"
  },
  "arrayOfIds": ["538b7c95c883570700ee9646", "538b7c95c883570700ee9647"],
  "arrayOfDates": ["2013-11-20T09:04:24.447Z", "2013-11-21T09:04:24.447Z"],
  "arrayOfObjects": [{
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  }, {
    "_id": "538b7c95c883570700ee9647",
    "date": "2013-11-21T09:04:24.447Z"
  }],
  "cost": 200,
  "seq": 2000
}]