如何在猫鼬3条件下对数据进行分组

Question

如何将集合猫鼬的数据按一定的条件分组，按以下3种条件分组：<5小时、5~9小时、>9小时。

按timeworkDay分组的数据。如果timeWorkDay数据小于5，它将被分组为timework5，如果数据大于5，小于9，则数据将分组为timework59，如果大于9，则将数据分组为timework9。

样本数据

const data = [
    {
        "_id": "620f3f7a2148a8227855068f",
        "timeWorkDay": 8,
        "created_at": "2022-02-18T06:40:58.932Z",
        "updated_at": "2022-02-18T07:54:59.331Z",
        "__v": 0,
    },
    {
        "_id": "6201e0e52faf8f0228dfad27",
        "created_at": "2022-02-08T03:17:57.018Z",
        "updated_at": "2022-02-08T03:17:57.018Z",
        "__v": 0,
        "timeWorkDay": 12,
    },
    {
        "_id": "61f21be553b6de54a8ef4e0b",
        "id_company": "61e00d1a144fa470f1870154",
        "created_at": "2022-02-03T02:48:57.006Z",
        "updated_at": "2022-02-01T02:04:29.778Z",
        "__v": 0,
        "timeWorkDay": 14,
    },
    {
        "_id": "61fb45647dda6444afd10e2e",
        "created_at": "2022-02-03T02:48:57.006Z",
        "updated_at": "2022-02-22T08:10:39.775Z",
        "__v": "2022-02-06T17:00:00.000Z",
        "timeWorkDay": 5,
    },
    More...
]

和预期数据

const result = [
timeWork5:[
    {
        "_id": "61fb45647dda6444afd10e2e",
        "created_at": "2022-02-03T02:48:57.006Z",
        "updated_at": "2022-02-22T08:10:39.775Z",
        "__v": "2022-02-06T17:00:00.000Z",
        "timeWorkDay": 5,
    },
    More...
],
timeWork59: [
    {
        "_id": "620f3f7a2148a8227855068f",
        "timeWorkDay": 8,
        "created_at": "2022-02-18T06:40:58.932Z",
        "updated_at": "2022-02-18T07:54:59.331Z",
        "__v": 0,
    },
    More...
],
timeWork9: [
    {
        "_id": "6201e0e52faf8f0228dfad27",
        "created_at": "2022-02-08T03:17:57.018Z",
        "updated_at": "2022-02-08T03:17:57.018Z",
        "__v": 0,
        "timeWorkDay": 12,
    },
    {
        "_id": "61f21be553b6de54a8ef4e0b",
        "id_company": "61e00d1a144fa470f1870154",
        "created_at": "2022-02-03T02:48:57.006Z",
        "updated_at": "2022-02-01T02:04:29.778Z",
        "__v": 0,
        "timeWorkDay": 14,
    },
    More...
],
]

我试过几种方法，但没有得到我预期的结果

const execQuery: any = await EmployeeModel.aggregate([
      {
        $group: {
          _id: {
            timeWorkDay5: {
              $cond: [
                {$lte: ["$timeWorkDay", 4]}
              ]
            },
            timeWorkDay9: {
              $cond: [
                {$gte: ["$timeWorkDay", 7]}
              ]
            },
          },
          createdAt: { $first: "$joinDate" },
          count: { $sum: 1 }
        }
      },
      { $sort: { joinDate: -1 } }
    ]);

Answer 1

认为$facet符合您的要求。

const execQuery: any = await EmployeeModel.aggregate([
  {
    $facet: {
      timeWorkDay5: [
        {
          $match: {
            $expr: {
              $lte: [
                "$timeWorkDay",
                4
              ]
            }
          }
        }
      ],
      timeWorkDay59: [
        {
          $match: {
            $expr: {
              $and: [
                {
                  $gte: [
                    "$timeWorkDay",
                    5
                  ]
                },
                {
                  $lt: [
                    "$timeWorkDay",
                    9
                  ]
                }
              ]
            }
          }
        }
      ],
      timeWorkDay9: [
        {
          $match: {
            $expr: {
              $gte: [
                "$timeWorkDay",
                9
              ]
            }
          }
        }
      ]
    }
  }
])

蒙戈游乐场样本