Mongoose 查询参考

Question

我的应用程序具有以下架构结构：

var User = new Schema({
  name: {type: String, required: true},
    screen_name: {type: String, required: true, index:{unique:true}},
    email: {type: String, required: true, unique:true},
    created_at: {type: Date, required: true, default: Date}
});


var Line = new Schema({
    user: {type: Schema.ObjectId, ref: 'User'},
    text: String,
    entered_at: {type: Date, required: true, default: Date}
});


var Story = new Schema ({
    sid: {type: String, unique: true, required: true},
    maxlines: {type: Number, default: 10}, // Max number of lines per user
    title: {type: String, default: 'Select here to set a title'},
    lines: [Line],
    created_at: {type: Date, required: true, default: Date}
});


var Story = db.model('Story', Story);
var User = db.model('User', User);

当我使用 sid 查询故事时，我希望它输出该故事中的行以及用户屏幕名称。

目前我正在使用以下查询故事：

app.get('/api/1/story/view/:id', function(req, res){
  Story.findOne({ sid: req.params.id }, function(err, story){
            if (err) {
            res.json(err);
        }
        else if(story == null) {
            res.json(err);
        }
        else{
        res.send(story);       
            }
        });
}); 

这只是带回这样的结果：

{
  "__v": 1,
  "_id": "5117878e381d7fd004000002",
  "sid": "DIY0Ls5NwR",
  "created_at": "2013-02-10T11:42:06.000Z",
  "lines": [
    {
      "user": "511782cab249ff5819000002",
      "text": "TESTING",
      "_id": "51178795381d7fd004000003",
      "entered_at": "2013-02-10T11:42:13.000Z"
    }
  ],
  "title": "Select here to set a title",
  "maxlines": 10
}

有一个使用该 _id 的用户设置，但我不完全确定如何输出故事以及如何将用户的屏幕名称甚至整个用户信息与输出一起包含在内

{
  "__v": 0,
  "screen_name": "Tam",
  "email": "test@test.com",
  "name": "Tam",
  "_id": "511782cab249ff5819000002",
  "created_at": "2013-02-10T11:21:46.000Z"
}

Answer 1

我尚未对其进行测试，但您应该可以使用 populate 来获取每个 lines 元素的完整用户文档，如下所示：

Story.findOne({sid: req.params.id})
    .populate('lines.user')
    .exec(function(err, story){ ...