> db.users.findOne(ObjectId("56e97630e62ae590e0d545a3"))
{
  "_id" : ObjectId("56e97630e62ae590e0d545a3"),
  "name" : "sample-user",
  "password" : "password",
  "created_at" : ISODate("2016-03-16T15:05:10.925Z"),
  "updated_at" : ISODate("2016-03-16T15:05:10.925Z")
}