Question

我的mongo集合包含以下文档：

{
    "_id" : ObjectId("52de74863fcc41ddfc7b23a5"),
    "ts" : "1385969614848",
    "Info" : [
        {
            "out" : 0,
            "Type" : "1",
            "Descr" : "Null0",
        },
        {
            "out" : 10,
            "Type" : "1",
            "Descr" : "Null",
        },
        {
            "out" : 20000,
            "Type" : "1",
            "Descr" : "Null0",
        },
        {
            "out" : 70,
            "Type" : "10",
            "Descr" : "abc",
        }
    ]
}
{
    "_id" : ObjectId("52de74863fcc41ddfc7b23a6"),
    "ts" : "1385969614852",
    "Info" : [
        {
            "out" : 500,
            "Type" : "1",
            "Descr" : "Null0",
        },
        {
            "out" : 100,
            "Type" : "1",
            "Descr" : "Null",
        },
        {
            "out" : 2896,
            "Type" : "1",
            "Descr" : "Null0",
        },
        {
            "out" : 4052,
            "Type" : "10",
            "Descr" : "abc",
        }
    ]
}

我想按键“out”排序。为此，我编写了以下mongo查询：

db.collection_name.find({},{"Info.out":1}).sort({"Info.out":1}).pretty()

然后显示以下输出：

{
    "_id" : ObjectId("52fa2922d73ddc832323f402"),
    "Info" : [
        {
            "out" : 0
        },
        {
            "out" : 10
        },
        {
            "out" : 20000
        },
        {
            "out" : 70
        }
    ]
}
{
    "_id" : ObjectId("52fa292ed73ddc832323f403"),
    "Info" : [
        {
            "out" : 500
        },
        {
            "out" : 100
        },
        {
            "out" : 2896
        },
        {
            "out" : 4052
        }
    ]
}

但是，我期望下面的输出：

    {
    "_id" : ObjectId("52fa2922d73ddc832323f402"),
    "Info" : [
        {
            "out" : 20000
        },
        {
            "out" : 70
        },
        {
            "out" : 10
        },
        {
            "out" : 0
        }
    ]
}
{
    "_id" : ObjectId("52fa292ed73ddc832323f403"),
    "Info" : [
        {
            "out" : 4052
        },
        {
            "out" : 2896
        },
        {
            "out" : 500
        },
        {
            "out" : 100
        }
    ]
}

有谁知道如何达到所需的输出？

Answer 1

使用以下aggregation framework操作：

db.collection.aggregate([
{$project: {_id:1, out: "$Info.out"} },
{$unwind: "$out"},
{$sort: {_id:1, "out":-1} },
{$group: {_id:"$_id" , "Info": { $push: {"out":"$out"}} } }
])

产生

{
    "result" : [
        {
            "_id" : ObjectId("52de74863fcc41ddfc7b23a6"),
            "Info" : [
                {
                    "out" : 4052
                },
                {
                    "out" : 2896
                },
                {
                    "out" : 500
                },
                {
                    "out" : 100
                }
            ]
        },
        {
            "_id" : ObjectId("52de74863fcc41ddfc7b23a5"),
            "Info" : [
                {
                    "out" : 20000
                },
                {
                    "out" : 70
                },
                {
                    "out" : 10
                },
                {
                    "out" : 0
                }
            ]
        }
    ],
    "ok" : 1
}

您可能还想查看：

db.collection.aggregate([
{$project: {_id:1, out: "$Info.out"} },
{$unwind: "$out"},
{$sort: {_id:1, "out":-1} },
{$group: {_id:"$_id" , "Info": { $push: "$out"} } }
])

将每个文档中的信息输出为＆＃34; clean＆＃34;阵列：

{
    "_id" : ObjectId("52de74863fcc41ddfc7b23a6"),
    "Info" : [
        4052,
        2896,
        500,
        100
    ]
}

Mongo嵌套键排序

1 个答案: