在MongoDB Document中将对象转换为数组[重复]

Question

我正在尝试将 mongoDB 文档对象转换为具有相同数据的数组。 我的文档结构如下：

{
    _id:"43434",
    fistname: 'Bob',
    lastname: 'Toto',
    address: { city: "cityName", postalCode: "000000", streetName: "streetname" },
}

我想像这样重组我的数据：

{
    _id:"43434",
    fistname: 'Bob',
    lastname: 'Toto',
    address: [{ city: "cityName", postalCode: "000000", streetName: "streetname" }],
}

我将如何实现这一目标？ 可以用mongo的$project（聚合）吗？

Answer 1

试试这个查询

db.tester.aggregate(
   [
       {$match:{"_id":ObjectId("5db06342f079fa02a63adaf8")}},
      {
         $project: {
            fistname: 1,
            lastname:1,
            address: [{ city:'$address.city','postalCode':'$address.postalCode',streetName:'$address.streetName'}]
         }
      }
   ]
)