Javascript 节点创建动态数组并用作响应

嗨，我正在创建一个空数组，然后使用forEach循环从mongo查询中填充数据

我已经尝试了4天了，我似乎什么都没做，我知道我很接近，但作为javascript和MEAN stack的新手，我就是想不出来

我已经附上了我试图做的每件事的注释代码

求求你，任何帮助都会很棒

var mongoose = require('mongoose'),
    User = require('../../models/UserModel'),
    async = require('async');


module.exports.getfollowing = function(req, res){

    //grab the Users ID from the body
    var thefollower = req.body.follower;

    //create empty array that i want to populate with the followee's ID and Avatar url
    var obj = [];

    //query mongo for the user
    User.findOne({ _id: thefollower }, function (err, user) {

            if (err) {

                console.log(err);
                res.json(err); 

            } else {

                //grab the following element of the users mongo schema -- should return all the followee's ID's -- tested works
                var following = user.following;

                //iritate throught all the followee's
                async.forEach(following, function(item, callback) {

                    //current followee
                    var user = item;

                    //query mongo for the followee
                    User.findOne({_id: user}, function(err, followee, callback){

                        //get followee's ID and Avatar url
                        var id = followee._id;
                        var avatar = followee.avatar;


                       //add the followee's ID and Avatar url to the obj array 
                       obj.push({                
                            id: id,
                            avatar: avatar                 
                       });

                    }); 

                    //see if this worked - returns empty
                    console.log(obj);
                    callback();

                }, function(err) {

                    //see if this worked - returns empty
                    console.log(obj);

                    //respond to the client - returns empty
                    res.json(obj);  

                });                  
            }   
    });  
};

---

您需要移动

回调（）

位于

async.forEach（）

回调的末尾，在

User.findOne（{u id:User}，…）

回调中（在调用

obj.push（）

之后），因为这是您实际完成

项的时候。使用当前代码，您会在mongo查询有机会完成之前，立即告诉
异步
模块您已完成
项
。
mscdex

在他的回答上当场解决了我的问题，以便将来帮助他人这里是代码

var mongoose = require('mongoose'),
    User = require('../../models/UserModel'),
    async = require('async');


module.exports.getfollowing = function(req, res){

    //grab the Users ID from the body
    var thefollower = req.body.follower;

    //create empty array that i want to populate with the followee's ID and Avatar url
    var obj = [];

    //query mongo for the user
    User.findOne({ _id: thefollower }, function (err, user) {

            if (err) {

                console.log(err);
                res.json(err); 

            } else {

                //grab the following element of the users mongo schema -- should return all the followee's ID's -- tested works
                var following = user.following;

                //iritate throught all the followee's
                async.forEach(following, function(item, callback) {

                    //current followee
                    var user = item;

                    //query mongo for the followee
                    User.findOne({_id: user}, function(err, followee){

                        //get followee's ID and Avatar url
                        var id = followee._id;
                        var avatar = followee.avatar;


                       //add the followee's ID and Avatar url to the obj array 
                       obj.push({                
                            id: id,
                            avatar: avatar                 
                       });

                    //see if this worked - returns empty
                    console.log(obj);
                    callback();

                    }); 


                }, function(err) {

                    //see if this worked - returns empty
                    console.log(obj);

                    //respond to the client - returns empty
                    res.json(obj);  

                });                  
            }   
    });  
};