重命名填充返回值 Mongoose

Question

我正在尝试返回返回的属性，就像在Mysql的AS 。 但具有重命名的对象属性。

询问

Games.find({leagueID:leagueID, result:{$ne: null}}).populate('home_id away_id').sort({date: -1}).execAsync()

输出

{
    home_id: {
        ...some details
    },
    away_id: {
        ...some details
    }
}

期望输出

{
    home: {
        ...some details
    },
    away: {
        ...some details
    }
}

那么我怎样才能得到想要的结果呢？

Answer 1

您可以使用聚合并像这样操作输出字段

db.collection.aggregate([{ $project:{_id:0, home:"$home_id", away:"$away_id"} }])

Answer 2

我的解决方案是使用转换功能。

GamesSchema.set('toJSON', {
    transform: function(doc, ret, options) {   
        if (mongoose.Types.ObjectId.isValid(ret.home)) {
            ret.homeId = ret.home;
            delete ret.home;
        }
        if (mongoose.Types.ObjectId.isValid(ret.away)) {
            ret.awayId = ret.away;
            delete ret.away;
        }
    }
});

没有人口：

输入

{
    "_id": "sD95OhsGrWVIqmTLVeuQdkna",
    "leagueID": 1000,
    "home": "404d1d9f68c3bb386b50f440" // ObjectId
    "away": "504d1d9f68c3bb386b50f450" // ObjectId
}

输出

{
    "_id": "sD95OhsGrWVIqmTLVeuQdkna",
    "leagueID": 1000,
    "homeId": "404d1d9f68c3bb386b50f440"
    "awayId": "504d1d9f68c3bb386b50f450"
}

随着人口：

输入

{
    "_id": "sD95OhsGrWVIqmTLVeuQdkna",
    "leagueID": 1000,
    "home": "404d1d9f68c3bb386b50f440" // ObjectId
    "away": "504d1d9f68c3bb386b50f450" // ObjectId
}

输出

{
    "_id": "sD95OhsGrWVIqmTLVeuQdkna",
    "leagueID": 1000,
    "home": {
        "_id": "404d1d9f68c3bb386b50f440",
        "name": "Home"
    }
    "away": {
        "_id": "504d1d9f68c3bb386b50f450",
        "name": "Away"
    }
}

Answer 3

试试 lodash 的 _.mapKeys，像这样：

const newObject = _.mapKeys(oldObject.toJSON(), (value, key) => {
            if (key === 'oldKey') return 'newKey';
            return key;
          });