Question

我正在尝试按日期对数据进行分组（具体而言是 WaterConsumption）：如果 creationDate = creationDate 我想对 WaterConsumption 求和。但我有点困惑 Mongoose Aggregate 是如何工作的。我的数据：

    {
      "_id": "60538930f4bb883b0fe40f2f",
      "creationDate": "2021-02-03T17:12:04.022Z",
      "duration": 400,
      "voltage": "220",
      "avgPower": 6241,
      "maxPower": 6473,
      "WaterConsumption": 27,
      "avgTemperature": 36,
      "shower": "5fb56ce7734b7e04b9c97c9b",
      "user": "5f6cb0496a8c5a0deaa1a746",
      "__v": 0,
      "id": "60538930f4bb883b0fe40f2f"
    },
    {
      "_id": "60538bfc49a75c3ca75c0088",
      "creationDate": "2021-02-16T17:21:00.615Z",
      "duration": 900,
      "voltage": "220",
      "avgPower": 4300,
      "maxPower": 5600,
      "WaterConsumption": 32,
      "avgTemperature": 28,
      "shower": "5fb56d04734b7e04b9c97c9c",
      "user": "5f6cb0496a8c5a0deaa1a746",
      "__v": 0,
      "id": "60538bfc49a75c3ca75c0088"
    }...

我的代码：

    let dateTwo = Measure.aggregate([
        {$match: {creationDate: "$creationDate"}},
        {$group: {_id: "$id", total: {$sum: "$WaterConsumption"}}}
    ])

我可以使用 JavaScript 做到这一点，但我不知道如何使用 Mongoose 做到这一点。

Answer 1

我使用代码解决了我的问题：

    let dateTwo = await Measure.aggregate([
        {$match: {duration: 360}},
        {$group: {_id: "$user", total: {$sum: "$WaterConsumption"}}}
    ]);

无法在猫鼬中聚合。参数必须是聚合管道运算符

1 个答案: