如果它包含一个匹配的字段，如何检查一个猫鼬对象引用？

Question

我不确定这是否正确或有效地完成...我需要查看是否在其他用户关注者中找到了用户/关注...

以下是代码：

var User = new Schema({

firstName: {type: String},
lastName: {type: String},
following: [{ type: ObjectId, ref: 'User' }]

 ......});



var userId2 = someoneElse;


var userId = req.query.userId;
        User.findOne(userId, function(err, results) {
                if(err) {
                        throw err;

                } else {
                        var i, newArrayF1, newArrayF2, biggerArraySize;
                        newArrayF1 = results.completedChallenges;
                        newArrayF2 = results.joinedChallenges;

                        if(newArrayF2.length > newArrayF1.length) {
                                biggerArraySize = newArrayF2.length;
                        } else {
                                biggerArraySize = newArrayF1.length;
                        }
                        for(i =0, i < biggerArraySize, i++) {
                                if(newArrayF1[i].followers.indexOf(userId2)) {
                                        var obj = {mtype: 2};
                                res.json(obj);
                                }

                                if(newArrayF2[i].following.indexOf(userId2)) {
                                        var obj = {mtype: 1};
                                res.json(obj);
                                }

                        }

                        if(i == biggerArraySize) {
                                var obj = {mtype: 0};
                                res.json(obj);
                        }

                }

        });

我正在检查用户是否与其他用户有以下/关注者连接并返回与之关联的整数，

Answer 1

您在抓取用户时可以使用populate。

User.findOne(userId).populate('following').exec(function (err, user) {
     user.following.forEach(function (person) {
           // here you have access to each person in the array
     }
}