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Mongo$group划分两个字段并显示结果[duplicate]

aggregation-framework mongoose mongodb node.js

Matheus Barem · 技术社区 · 6 年前

我试图根据计算字段计算MongoDB查询中的百分比-不确定这是否可行。我希望能够计算失败百分比: (failed count / total) * 100

    {
            "_id" : ObjectId("52dda5afe4b0a491abb5407f"),
            "type" : "build",
            "time" : ISODate("2014-01-20T22:39:43.880Z"),
            "data" : {
                    "buildNumber" : 30,
                    "buildResult" : "SUCCESS"
            }
    },
    {
            "_id" : ObjectId("52dd9fede4b0a491abb5407a"),
            "type" : "build",
            "time" : ISODate("2014-01-20T22:15:07.901Z"),
            "data" : {
                    "buildNumber" : 4,
                    "buildResult" : "FAILURE"
            }
    },
    {
            "_id" : ObjectId("52dda153e4b0a491abb5407b"),
            "type" : "build",
            "time" : ISODate("2014-01-20T22:21:07.790Z"),
            "data" : {
                    "buildNumber" : 118,
                    "buildResult" : "SUCCESS"
            }
    }

这是我要处理的问题。问题出在FailPercent/$divide行中:

db.col.aggregate([    
    { $match: { "data.buildResult" : { $ne : null } } },
    { $group: {          
        _id: {              
            month: { $month: "$time" },             
            day: { $dayOfMonth: "$time" },             
            year: { $year: "$time" },                       
        },         
        Aborted: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "ABORTED"]}, 1, 0]} },
        Failure: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "FAILURE"]}, 1, 0]} },
        Unstable: { $sum: { $cond : [{ $eq : ["$data.buildResult", "UNSTABLE"]}, 1, 0]} },
        Success: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "SUCCESS"]}, 1, 0]} },
        Total: { $sum: 1 },
        FailPercent: { $divide: [ "Failure", "Total" ] }
    } },     
    { $sort: { "_id.year": 1, "_id.month": 1, "_id.day": 1 } } 
])

0 回复 | 直到 10 年前

Anand Jayabalan 10 年前

你差点就搞定了。唯一需要改变的是,您必须计算 FailPercent project 阶段,因为总数只有在完成后才可用 group 阶段。试试这个:

db.foo.aggregate([    
    { $match: { "data.buildResult" : { $ne : null } } },
    { $group: {          
        _id: {              
            month: { $month: "$time" },             
            day: { $dayOfMonth: "$time" },             
            year: { $year: "$time" },                       
        },         
        Aborted: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "ABORTED"]}, 1, 0]} },
        Failure: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "FAILURE"]}, 1, 0]} },
        Unstable: { $sum: { $cond : [{ $eq : ["$data.buildResult", "UNSTABLE"]}, 1, 0]} },
        Success: { $sum: { $cond :  [{ $eq : ["$data.buildResult", "SUCCESS"]}, 1, 0]} },
        Total: { $sum: 1 }
    } }, 
    {$project:{Aborted:1, Failure:1, Unstable:1, Success:1, Total:1, FailPercent: { $divide: [ "$Failure", "$Total" ]}}},
    { $sort: { "_id.year": 1, "_id.month": 1, "_id.day": 1 } } 
])