javascript - 添加到父对象的 Mongoose 子对象未正确保存

Question

我有一个名为“玩家”的架构，另一个名为“游戏”的架构。每个游戏都有一个名为“玩家”的属性，它是对玩家对象的引用数组。

游戏架构

let GameSchema = new mongoose.Schema({
    players: [{
        ref: "Player",
        type: mongoose.Schema.Types.ObjectId,
    }],
    created: {
        type: Date,
        default: Date.now,
    }
}, { usePushEach: true });

玩家架构

let PlayerSchema = new mongoose.Schema({
    parentGameId: mongoose.Schema.Types.ObjectId,
    idInGame: Number,
    points: Number,
});

MongoDb 连接

mongoose.Promise = global.Promise;
mongoose.connect("mongodb://localhost/ScoreKeeper", { useMongoClient: true });

用于在后期路线上初始化游戏和玩家的代码。 (我使用的是 Express)

app.post('/', function(req, res) {
    let players = Number(req.body.players);
    Game.create({
        players: [],
    }, function(error, newGame) {
        if (error) {
            console.log(error);
        } else {
            let currentGameID = newGame._id;
            for (let i = 1; i <= players; i++) {
                Player.create({
                    parentGameId: currentGameID,
                    idInGame: i,
                    points: 0
                }, function(error, newPlayer) {
                    if (error) {
                        console.log(error);
                    } else {  
                        newGame.players.push(newPlayer._id);
                        newGame.save(function(error, newGame) {
                            if (error) {
                                console.log(error);
                            } else {
                                console.log("New Player added");
                            }
                        });

                    }
                });
            }
        }

    });
});

在节点控制台的终端上，当我创建 5 个玩家时，我有以下输出:

New Player added

New Player added

New Player added

New Player added

New Player added

现在，当我进入 mongo 控制台并查看玩家集合时，我发现按照预期创建了 5 个玩家。使用“db.players.find()”

{ "_id" : ObjectId("5a6159685d3dabb00d0065b0"), "parentGameId" : ObjectId("5a6159685d3dabb00d0065af"), "idInGame" : 1, "points" : 0, "__v" : 0 }

{ "_id" : ObjectId("5a6159685d3dabb00d0065b1"), "parentGameId" : ObjectId("5a6159685d3dabb00d0065af"), "idInGame" : 2, "points" : 0, "__v" : 0 }

{ "_id" : ObjectId("5a6159685d3dabb00d0065b2"), "parentGameId" : ObjectId("5a6159685d3dabb00d0065af"), "idInGame" : 3, "points" : 0, "__v" : 0 }

{ "_id" : ObjectId("5a6159685d3dabb00d0065b3"), "parentGameId" : ObjectId("5a6159685d3dabb00d0065af"), "idInGame" : 4, "points" : 0, "__v" : 0 }

{ "_id" : ObjectId("5a6159685d3dabb00d0065b4"), "parentGameId" : ObjectId("5a6159685d3dabb00d0065af"), "idInGame" : 5, "points" : 0, "__v" : 0 }

但是，当我在 mongo 控制台中检查游戏对象时，我发现......

db.games.findOne()

{

"_id" : ObjectId("5a6159685d3dabb00d0065af"),

"created" : ISODate("2018-01-19T02:35:20.632Z"),

"players" : [

    ObjectId("5a6159685d3dabb00d0065b1"),

    ObjectId("5a6159685d3dabb00d0065b1"),

    ObjectId("5a6159685d3dabb00d0065b0"),

    ObjectId("5a6159685d3dabb00d0065b1"),

    ObjectId("5a6159685d3dabb00d0065b0"),

    ObjectId("5a6159685d3dabb00d0065b2"),

    ObjectId("5a6159685d3dabb00d0065b3"),

    ObjectId("5a6159685d3dabb00d0065b3"),

    ObjectId("5a6159685d3dabb00d0065b4")

],

"__v" : 5

}

游戏和玩家之间不匹配，我觉得错误在于添加newPlayer后保存newGame。奇怪的是，_v 属性按预期读取 5。您能指出我修复该错误吗？

谢谢

Answer 1

您的代码中保存游戏文档时存在错误

使用 update 方法和 push 代替 save 来添加玩家的 ObjectId

newGame.update({$push:{players : newPlayer._id} }, function(error, newGame) {...}

控制台输出

Mongoose: games.insert({ _id: ObjectId("5a6168c12478110e7aa74d5d"), created: new Date("Fri, 19 Jan 2018 03:40:49 GMT"), players: [], __v: 0 })
Mongoose: players.insert({ parentGameId: ObjectId("5a6168c12478110e7aa74d5d"), idInGame: 1, points: 0, _id: ObjectId("5a6168c12478110e7aa74d5e"), __v: 0 })
Mongoose: players.insert({ parentGameId: ObjectId("5a6168c12478110e7aa74d5d"), idInGame: 2, points: 0, _id: ObjectId("5a6168c12478110e7aa74d5f"), __v: 0 })
Mongoose: players.insert({ parentGameId: ObjectId("5a6168c12478110e7aa74d5d"), idInGame: 3, points: 0, _id: ObjectId("5a6168c12478110e7aa74d60"), __v: 0 })
Mongoose: players.insert({ parentGameId: ObjectId("5a6168c12478110e7aa74d5d"), idInGame: 4, points: 0, _id: ObjectId("5a6168c12478110e7aa74d61"), __v: 0 })
Mongoose: players.insert({ parentGameId: ObjectId("5a6168c12478110e7aa74d5d"), idInGame: 5, points: 0, _id: ObjectId("5a6168c12478110e7aa74d62"), __v: 0 })
Mongoose: games.update({ _id: ObjectId("5a6168c12478110e7aa74d5d") }, { '$push': { players: ObjectId("5a6168c12478110e7aa74d62") } }, {})
Mongoose: games.update({ _id: ObjectId("5a6168c12478110e7aa74d5d") }, { '$push': { players: ObjectId("5a6168c12478110e7aa74d5f") } }, {})
Mongoose: games.update({ _id: ObjectId("5a6168c12478110e7aa74d5d") }, { '$push': { players: ObjectId("5a6168c12478110e7aa74d61") } }, {})
Mongoose: games.update({ _id: ObjectId("5a6168c12478110e7aa74d5d") }, { '$push': { players: ObjectId("5a6168c12478110e7aa74d60") } }, {})
Mongoose: games.update({ _id: ObjectId("5a6168c12478110e7aa74d5d") }, { '$push': { players: ObjectId("5a6168c12478110e7aa74d5e") } }, {})

mongo CLI

> db.players.find()
{ "_id" : ObjectId("5a6168c12478110e7aa74d5f"), "parentGameId" : ObjectId("5a6168c12478110e7aa74d5d"), "idInGame" : 2, "points" : 0, "__v" : 0 }
{ "_id" : ObjectId("5a6168c12478110e7aa74d61"), "parentGameId" : ObjectId("5a6168c12478110e7aa74d5d"), "idInGame" : 4, "points" : 0, "__v" : 0 }
{ "_id" : ObjectId("5a6168c12478110e7aa74d5e"), "parentGameId" : ObjectId("5a6168c12478110e7aa74d5d"), "idInGame" : 1, "points" : 0, "__v" : 0 }
{ "_id" : ObjectId("5a6168c12478110e7aa74d60"), "parentGameId" : ObjectId("5a6168c12478110e7aa74d5d"), "idInGame" : 3, "points" : 0, "__v" : 0 }
{ "_id" : ObjectId("5a6168c12478110e7aa74d62"), "parentGameId" : ObjectId("5a6168c12478110e7aa74d5d"), "idInGame" : 5, "points" : 0, "__v" : 0 }
> 
> 
> db.games.find().pretty()
{
    "_id" : ObjectId("5a6168c12478110e7aa74d5d"),
    "created" : ISODate("2018-01-19T03:40:49.028Z"),
    "players" : [
        ObjectId("5a6168c12478110e7aa74d62"),
        ObjectId("5a6168c12478110e7aa74d5f"),
        ObjectId("5a6168c12478110e7aa74d61"),
        ObjectId("5a6168c12478110e7aa74d60"),
        ObjectId("5a6168c12478110e7aa74d5e")
    ],
    "__v" : 0
}
>