> db.measurements.find()
{ "_id" : ObjectId("5a61e1834c154515ffaa66ed"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 35, "humidity" : 10, "createdAt" : ISODate("2018-01-19T13:16:03.177Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e1c112e1591610649436"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 98, "humidity" : 74, "createdAt" : ISODate("2018-01-19T13:17:05.686Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e24a98c313162c62f11e"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 57, "humidity" : 23, "createdAt" : ISODate("2018-01-19T13:19:22.042Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e2d1afb23d1642a8f9ea"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 86, "humidity" : 71, "createdAt" : ISODate("2018-01-19T13:21:37.382Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e2f67f57661649885b68"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 12, "humidity" : 63, "createdAt" : ISODate("2018-01-19T13:22:14.311Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e37559318916563c0d1f"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 93, "humidity" : 81, "createdAt" : ISODate("2018-01-19T13:24:21.242Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e4134ef22d166df25973"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 11, "humidity" : 4, "createdAt" : ISODate("2018-01-19T13:26:59.972Z"), "__v" : 0 }
{ "_id" : ObjectId("5a61e42e222d5b1673bf8a37"), "parentRoomId" : ObjectId("5a61c3c58328300cf2d85562"), "temperature" : 68, "humidity" : 85, "createdAt" : ISODate("2018-01-19T13:27:26.042Z"), "__v" : 0 }
>


> db.measurements.getIndexes()
[
	{
		"v" : 2,
		"key" : {
			"_id" : 1
		},
		"name" : "_id_",
		"ns" : "wisehome.measurements"
	},
	{
		"v" : 2,
		"key" : {
			"createdAt" : 1
		},
		"name" : "createdAt_1",
		"ns" : "wisehome.measurements",
		"expireAfterSeconds" : 60
	}
]