通过ID查找和删除猫鼬数组中的子文档

Question

我正试图用Mongoose删除数组中的子文档。

我的数据：

{
    "_id": {
        "$oid": "5d88dfe45feb4c06a5cfb762"
    },
    "spaces": [{
        "_id": {
            "$oid": "5d88dfe45feb4c06a5cfb76f"
        },
        "name": "Building 2",
        "subSpace": [{
            "_id": {
                "$oid": "5d88dfe45feb4c06a5cfb771"
            },
            "name": "Basement"
        }, {
            "_id": {
                "$oid": "5d88dfe45feb4c06a5cfb770"
            },
            "name": "Floors"
        }]
    }, {
        "_id": {
            "$oid": "5d88dfe45feb4c06a5cfb76c"
        },
        "name": "Building 4",
        "subSpace": [{
            "_id": {
                "$oid": "5d88dfe45feb4c06a5cfb76e"
            },
            "name": "Basement"
        }, {
            "_id": {
                "$oid": "5d88dfe45feb4c06a5cfb76d"
            },
            "name": "Floors"
        }]
    }]
}

对于此示例，我们要使用此_id删除 2号楼中的子空间楼层： 5d88dfe45feb4c06a5cfb771

我的代码（在模型中）：

exports.removeSubSpaceById = (subSpaceId) => {
    Residence.findOneAndUpdate( { "spaces.subSpace._id": '5d88dfe45feb4c06a5cfb771' },
        { $pull: 
        { spaces: 
        { subSpace: 
        { _id: '5d88dfe45feb4c06a5cfb771' }}}}, function(err, result) {
            console.log(result);
    })
};

输出：console.log：我的整个文档 但是subSpace / Basement（ 5d88dfe45feb4c06a5cfb771 ）仍在我的文档中。

感谢您的帮助。

Answer 1

使用位置运算符进行嵌套数组操作。 MongoDb Docs

exports.removeSubSpaceById = (subSpaceId) => {
Residence.findOneAndUpdate({ "spaces._id": '5d88dfe45feb4c06a5cfb76f' },
    {
        $pull:
        {
            "spaces.$.subSpace": { _id: "5d88dfe45feb4c06a5cfb771" }
        }
    }, function (err, result) {
        console.log(result);
    })

}