Mongoose 填充文档

Question

我在 mongoose 中有 3 个数据库模型，如下所示：

//profile.js
var ProfileSchema   = new Schema({
    username:    { type: String, required: true },                   
    password:    { type: String, required: true },                   
    matches:    [{ type: Schema.Types.ObjectId, ref: 'Match' }]
});

//match.js
var MatchSchema   = new Schema({ 
    scores:     [{ type: Schema.Types.ObjectId, ref: 'Score',  required: true }],
});

//score.js
var ScoreSchema   = new Schema({
    score:       {type: Number, required: true},
    achivement: [{type: String, required: true}],
});

我尝试用

填充个人资料

Profile.findOne({ _id: mongoose.Types.ObjectId(profile_id) })
            .populate('matches')
            .populate('matches.scores')
            .exec(function(err, profile) {
                if (err) {...}
                if (profile) {
                   console.log(profile);
                }
            });

匹配被填充，但我没有得到匹配的分数来填充。猫鼬不支持这一点还是我做错了什么？填充给了我这个：

{
    user_token: "539b07397c045fc00efc8b84"
    username: "username002"
    sex: 0
    country: "SE"
    friends: []
    -matches: [
        -{
            __v: 1
            _id: "539eddf9eac17bb8185b950c"
            -scores: [
                "539ee1c876f274701e17c068"
                "539ee1c876f274701e17c069"
                "539ee1c876f274701e17c06a"
            ]
        }
    ]
}

但我想在匹配数组中填充分数数组。我可以这样做吗？

Answer 1

是的，你是对的。我尝试使用填充链我得到了相同的输出。

对于您的查询，请使用async.js，然后通过下面提到的方法填充。

更多详情请查看此代码snippet。根据您的查询，它是一个工作的、经过测试的示例代码。 请仔细阅读下面的代码和提供的sn-p链接中的注释代码以更好地理解。

//Find the profile and populate all matches related to that profile
Profile.findOne({
    _id: mongoose.Types.ObjectId(profile_id)
})
.populate('matches')
.exec(function(err, profile) {
    if (err) throw err;

    //We got the profile and populated matches in Array Form
    if (profile) {
        // Now there are multiple Matches
        // We want to fetch score of each Match
        // for that particular profile

        // For each match related to that profile
        async.forEach(profile.matches, function(match) {
            console.log(match, 'match')
            // For each match related to that profile
            // Populate score achieved by that person
            Match.find({
                _id:match.id
            })
            .populate('scores', 'score')
            .exec(function (err, score) {
                if (err) throw err;

                // here is score of all the matches
                // played by the person whose profile id
                // is passed
                console.log(score);
            })
        })
    }
});

Answer 2

Profile.findOne({ _id: mongoose.Types.ObjectId(profile_id) })
        .populate('matches.scores')
        .exec(function(err, profile) {
            if (err) {...}
            if (profile) {
               console.log(profile);
            }
        });