减去日期通过Pikking从Array查询Mongo

Question

我想从MongoDB中的结帐日期减去签入日期

我该怎么做？

来自MongoDB的数据： -

"timeLogs" : [ 
        {
            "type" : "chekin",
            "date" : ISODate("2017-05-02T05:10:00.000Z"),
            "_id" : ObjectId("590822c66216cf3864740e3d")
        }, 
        {
            "type" : "checkout",
            "date" : ISODate("2017-05-02T14:10:00.000Z"),
            "_id" : ObjectId("59088037feb56c0fcd60a090")
        }
    ]

任何帮助都会得到满足。

Answer 1

我不太确定您希望格式如何，您可以尝试将这些选项作为日期或小时。

    db.getCollection('Date').aggregate([
    {
        $project: {
              _id: "$_id",
              startDate: {
                      $arrayElemAt: ["$timeLogs", 0]
              },    
              endDate: {
                      $arrayElemAt: ["$timeLogs", 1]   
              }
        }
    }, {
        $project: {
              timeDiff: {
                    $divide: [{
                        $subtract: ["$endDate.date", "$startDate.date"]

                        }, 1000 * 60 * 60]


              }

        }    

    }
])

或作为日期

db.getCollection('sample date').aggregate([
    {
        $project: {
              _id: "$_id",
              startDate: {
                      $arrayElemAt: ["$timeLogs", 0]
              },    
              endDate: {
                      $arrayElemAt: ["$timeLogs", 1]   
              }
        }
    }, {
        $project: {
              timeDiff: {
                    $add: [new Date(0), {
                        $subtract: ["$endDate.date", "$startDate.date"]

                        }]


              }

        }    

    }
])

对于mongo＆lt; 3.2

db.getCollection('Date').aggregate([
    {
      $unwind: "$timeLogs"  
    },
    {
        $group: {
              _id: "$_id",
              startDate: {
                      $first: "$timeLogs"
              },    
              endDate: {
                      $last: "$timeLogs"   
              }
        }
    }, {
        $project: {
              timeDiff: {
                    $add: [new Date(0), {
                        $subtract: ["$endDate.date", "$startDate.date"]

                        }]


              }

        }    

    }
])