Question

我有一个具有以下结构的mongodb数据库

{
 "_id" : ObjectId("56f1492e95136b7d113dd1c7"),   
"name" : "Terminal 1 Sample Port",
"owl" : [ 
    {
        "macId" : "443A3",
        "hostName" : "Old",
        "group" : "High Mast Lighting",
        "subGroup" : "Public Marshalling Area"
    }, 
    {
        "macId" : "4437",
        "hostName" : "LED Mast 7",
        "group" : "High Mast Lighting",
        "subGroup" : "Public Marshalling Area"
    },
   {
        "macId" : "4437190",
        "hostName" : "Ground Floor",
        "group" : "Terminal 1",
        "subGroup" : "Ground Floor"
    }, 
    {
        "macId" : "44387",
        "hostName" : "LED 80mt ",
        "group" : "High Mast Lighting",
        "subGroup" : "Commercial Goods Area"
    },
]

}

我想转换为以下结构

 [
        { "name": "High Mast Lighting", 
          "subvalues": [{ 
                            "name": "Public Marshalling Area", 
                            "subvalues": 
                                        [{ "id": "44373",                              
                                            "name": "Old  3"
                                        }, 
                                        {  "id": "443778", 
                                           "name": "LED Light Mast 7"
                                        }]
                     }]
        }
]

我能够使用lodash做同样的事情，但我想知道使用mongodb聚合框架是否可以实现相同

Answer 1

你需要玩它 - 但作为输出你会得到你想要的东西：

db.a.aggregate([
{$unwind:"$owl"},
{$group: {
    _id:{"name":"$owl.group", "subvaluesName":"$owl.subGroup" },
     subvalues1: { $addToSet:{ "id": "$owl.macId" , "name":"$owl.hostName"}}   
     }},

   {
       $project:{
           _id:0,
           name:"$_id.name",
           subvalues:{
               name:"$_id.subvaluesName",
               subvalues:"$subvalues1"
               }
           }}
])

输出：

{
    "name" : "High Mast Lighting",
    "subvalues" : {
        "name" : "Public Marshalling Area",
        "subvalues" : [ 
            {
                "id" : "443A3",
                "name" : "Old"
            }, 
            {
                "id" : "4437",
                "name" : "LED Mast 7"
            }
        ]
    }
}

并保持更改使用$ out作为最后一个聚合阶段。

用于更改MongoDB中数据结构的聚合管道

1 个答案: