node.js - MongoDB:如何将嵌套数组分组到一个文档中？

Question

我有以下集合:

{
    id: 23423-dsfsdf-32423,
    name: Proj1,
    services: [
         {
            id:sdfs-24423-sdf,
            name:P1_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-24jhh-sdf,
            name:P1_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-2jnbn3-sdf,
            name:P1_Service3,
            products:[{},{},{}]
         }
    ]
},
{
    id: 23423-cxcvx-32423,
    name: Proj2,
    services: [
         {
            id:sdfs-xvxcv-sdf,
            name:P2_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-xvwqw-sdf,
            name:P2_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-erdfd-sdf,
            name:P2_Service3,
            products:[{},{},{}]
         }
    ]
}

我需要返回一个包含所有服务数组的文档:

{
    services: [
         {
            id:sdfs-24423-sdf,
            name:P1_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-24jhh-sdf,
            name:P1_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-2jnbn3-sdf,
            name:P1_Service3,
            products:[{},{},{}]
         },
         {
            id:sdfs-xvxcv-sdf,
            name:P2_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-xvwqw-sdf,
            name:P2_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-erdfd-sdf,
            name:P2_Service3,
            products:[{},{},{}]
         }
     ]
}

我得到的最多的是:

db.projects.aggregate({"$group":{"_id":"services","services":{"$push":"$services"}}})

但这会返回一个包含数组数组的文档，而我想要一个对象数组:

{
    _id:"services",
    services:[
        [
            {
            id:sdfs-24423-sdf,
            name:P1_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-24jhh-sdf,
            name:P1_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-2jnbn3-sdf,
            name:P1_Service3,
            products:[{},{},{}]
         }
        ],
        [
            {
            id:sdfs-xvxcv-sdf,
            name:P2_Service1,
            products:[{},{},{}]
         },
         {
            id:sdfs-xvwqw-sdf,
            name:P2_Service2,
            products:[{},{},{}]
         },
         {
            id:sdfs-erdfd-sdf,
            name:P2_Service3,
            products:[{},{},{}]
         }
        ]
    ]
}

我无法弄清楚数组聚合或连接或联合或其他什么。最终我也必须对产品做同样的事情(将所有项目的所有服务的所有产品作为一个产品数组并将文档返回到服务器，但首先要做的事情......

10x

Answer 1

您需要对 null _id 进行分组，以便将所有服务分组到单个文档中。另外，在分组之前 $unwind 服务数组，否则组将为您提供数组数组

db.project.aggregate(
  {$unwind: '$services'},
  {$group: {_id:null, services: {$push: '$services'}}}
)