Question

我表中的文档结构如下：

const mongoose = require('mongoose');

const logSchema = new mongoose.Schema({
    eventName: {
        type: String,
        required: true,
        enum: ['connect', 'status', 'probability'],
    },
    timestamp: {
        type: Date,
        required: true,
    }
}, {
    timestamps: true
});

const Log = mongoose.model('Log', logSchema);

module.exports = Log;

我的意图是提取大小为7的数组（过去7天-过去一周）。每个项目都是具有2个主要字段的JSON：开始和结束的计数器。我想计算第0<=i<=7天有多少文档被视为开始，而有多少文档被视为结束。

将文档视为eventName === 'connect的开始，否则认为文档的结束。

这是我当前的代码，该代码通常计算每天（开始和结束）每天有多少个文档。但是我想更改它，以使每天有多少个被视为开始，有多少个被视为结束。我该怎么办？

weeklyLogs = await Log.aggregate([
    { $match: { timestamp: { $gte: moment.tz('Asia/Jerusalem').subtract(6, 'days').startOf('day').toDate() } } },
    {
        $group: {
            _id: {
                $dateFromParts: {
                    year: { $year: { date: "$timestamp", timezone: "Asia/Jerusalem" } },
                    month: { $month: { date: "$timestamp", timezone: "Asia/Jerusalem" } },
                    day: { $dayOfMonth: { date: "$timestamp", timezone: "Asia/Jerusalem" } },
                    timezone: "Asia/Jerusalem"
                }
            },
            documents: { $sum: 1 }
        }
    },
    { $project: { documents: 1 } }
]);

Answer 1

方法1

为>> [SensData , SensInfo] = GetData([], 'Acceleration') SensData = [10x1 double] [10x1 double] SensInfo = nSensor: 2 SensorType: 'Acceleration'添加条件：

$sum

方法2

您可以使用weeklyLogs = await Log.aggregate([ { $match: { timestamp: { $gte: moment.tz('Asia/Jerusalem').subtract(6, 'days').startOf('day').toDate() } } }, { $group: { _id: { $dateFromParts: { year: { $year: { date: "$timestamp", timezone: "Asia/Jerusalem" } }, month: { $month: { date: "$timestamp", timezone: "Asia/Jerusalem" } }, day: { $dayOfMonth: { date: "$timestamp", timezone: "Asia/Jerusalem" } }, timezone: "Asia/Jerusalem" } }, start: { $sum: { $cond: [ { $eq: ['$eventName', 'connect'] }, 1, 0] } }, end: { $sum: { $cond: [ { $ne: ['$eventName', 'connect'] }, 1, 0] } } } } ]);处理多个聚合管道，如下所示：

$facet

从数据库中获取2个计数器

1 个答案:

方法1

方法2