每天聚合mongoDB

Question

我刚刚在mongoDB初学者。我有一些文件，我想每天平均，它有4个名字是Vol，Cur，Consump，ConsumpH，但我不知道怎么办。

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b3"
    },
    "name": "Vol",
    "value": 223,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b4"
    },
    "name": "Cur",
    "value": 0,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b5"
    },
    "name": "Consumpt",
    "value": 0,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b6"
    },
    "name": "ConsumpH",
    "value": 287,
    "date": "Tue Jun 13 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b8"
    },
    "name": "Vol",
    "value": 223,
    "date": "Tue Jun 13 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b9"
    },
    "name": "Cur",
    "value": 0,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b10"
    },
    "name": "Consump",
    "value": 0,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}

{
    "_id": {
        "$oid": "5b1f377fc4a66f3954a8a6b11"
    },
    "name": "ConsumpH",
    "value": 287,
    "date": "Tue Jun 12 2017 10:01:19 GMT+0700 (SE Asia Standard Time)"
}