使用 mgov2 的 Mongodb 查询

Question

我有一系列在各种 channel 上进行的端点测试。集合中的示例文档是:

{
    "_id" : ObjectId("59959b30c699811077751b12"),
    "teststatus" : "Fail",
    "channelname" : "HouseController",
    "timestamp" : ISODate("2017-08-17T13:15:53.170Z"),
    "testid" : "llpKIgIfiiquqkSApwNn"
}

我正在查询这个以投影这样的结果:

[
  {
    "Fail": 20,
    "Success Count": 30,
    "Total": 50,
    "channel": "c3"
  }, ...

但我对成功率和失败率的计数有误。我当前在 golang 中的查询如下所示:

o1:=  bson.M{
    "$project" :bson.M{
        "channel": "$channelname",
        "time":"$timestamp",
        "teststatus" : "$teststatus",
        "_id":1,
    },
}
o2:=  bson.M{
    "$group" :bson.M{
        "_id": "$channel",
        "Success": bson.M{
            "$sum":bson.M{ "$eq" :"teststatus","Pass"},
        },
        "Total": bson.M{
            "$sum": 1,
        },
    },
}
o3:=  bson.M{
    "$project" :bson.M{
        "channel": "$_id",
        "Success Count":"$Success",
        "Total" : "$Total",
        "_id":0,
        "Fail": bson.M{
            "$subtract": []interface{}{"$Total", "$Success"},
        },
    },
}

我在计算成功计数时做错了。我只是想不出正确的做法。我刚刚开始使用 mgo 和 golang。

提前致谢

Answer 1

您需要使用$cond 进行条件计数。例如，以下计算一步中的所有测试、失败测试和成功测试:

o2 := bson.M{
    "$group" :bson.M{
        "_id": "$channel",
        "Total": bson.M{
            "$sum": 1,
        },
        "Success": bson.M{"$sum": bson.M{
            "$cond": []interface{}{
                bson.M{ "$eq": []interface{}{"$teststatus", "Pass"}},
                1, 0,
            },
        }},
        "Fail": bson.M{"$sum": bson.M{
            "$cond": []interface{}{
                bson.M{"$eq": []interface{}{"$teststatus", "Fail"}},
                1, 0,
            },
        }},
    },
}