mongodb：删除数组中的对象，嵌套在两个对象中

Question

我正在尝试删除数组中的一个对象。但是该数组嵌套在两个对象中。我该怎么做？

例如：假设我想删除交易 _id: 58c3154a19f82c0ddc53f0de

我该怎么做？？

{
    "_id": {
        "$oid": "58bad6cf93ab9703da331e25"
    },
    "username": "david.lam@transfast.com",
    "password": "sha1$fc05ad7d$1$1cc86a287642516f947fda520ae8ddd42e983e23",
    "firstName": "David",
    "lastName": "David",
    "transactions": {
        "2017": {
            "3": [
                {
                    "where": "Duane Reade",
                    "what": "asdf",
                    "category": 6,
                    "amount": "34",
                    "_id": {
                        "$oid": "58c300ef1602f90c7166cbfb"
                    },
                    "date": {
                        "day": 10,
                        "month": 3,
                        "year": 2017
                    }
                },
                {
                    "where": "Amazon",
                    "what": "asdf",
                    "category": 2,
                    "amount": "100",
                    "_id": {
                        "$oid": "58c3154a19f82c0ddc53f0de"
                    },
                    "date": {
                        "day": 10,
                        "month": 3,
                        "year": 2017
                    }
                }
            ]
        }
    }
}

Answer 1

为此，您需要使用$pull 运算符。使用点符号寻址数组元素。以下查询完成了这项工作：

db.user1.update({},
    {$pull: {'transactions.2017.3': {_id: ObjectId("58c3154a19f82c0ddc53f0de")}}
});