Mongoose:获取完整的用户列表 [英] Mongoose: Get full list of users

问题描述

我尝试使用 Mongoose 发送所有用户的列表如下:

I have tried to use Mongoose to send the list of all users as follows:

server.get('/usersList', function(req, res) {
    var users = {};

    User.find({}, function (err, user) {
        users[user._id] = user;
    });

    res.send(users);
});

当然，res.send(users); 是要发送{}，这不是我想要的.是否有语义略有不同的 find 替代方案，我可以在其中执行以下操作?

Of course, res.send(users); is going to send {}, which is not what I want. Is there a find alternative with slightly different semantics, where I could do the following?

server.get('/usersList', function(req, res) {    
    User.find({}, function (err, users) {
        res.send(users);
    });
});

本质上，我希望只有在从数据库中获取所有用户时才执行回调.

Essentially, I want the callback to be executed only when all the users have been fetched from the database.

推荐答案

好吧，如果你真的想返回一个从 _id 到 user 的映射，你总是可以这样做:

Well, if you really want to return a mapping from _id to user, you could always do:

server.get('/usersList', function(req, res) {
  User.find({}, function(err, users) {
    var userMap = {};

    users.forEach(function(user) {
      userMap[user._id] = user;
    });

    res.send(userMap);  
  });
});

find() 返回数组中所有匹配的文档，因此您最后剪下的代码将该数组发送给客户端.

find() returns all matching documents in an array, so your last code snipped sends that array to the client.

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