Question

我有一个类似父文档的模式是User，子文档是batchSchema。我的架构在这里

var batchSchema = new Schema({
   batchname: {
        type: String,
        required: true,
        unique: true
    },
    activityname: {
        type: String,
        required: true
    },
    time: {
    type:String,
    required:true
    },
    duration: {
    type:String,
    required:true
    },
    classtype: {
    type:String,
    required:true
    },
    trainer: {
    type:String,
    required:true
    },
    price:{
    type:Currency,
    required:true,
    unique:true
    },

}, {
    timestamps: true
});

var User = new Schema({
username:String,
firstname:String,
lastname:String,
password:String,
batches:[batchSchema]

});

当我想在没有batchSchema详细信息的情况下在id的帮助下查看用户的详细信息然后打印两者。它的代码是

router.get('/:userId',function (req, res, next) {
    User.findById(req.params.userId, function (err, user) {
        if (err) throw err;
        res.json(user);
    });
});

你可以看到我问题的例子。

{
  "_id": "58c66ed333a2171acc603481",
  "username": "joe",
  "firstname": "jain",
  "lastname": "jam",
  "__v": 1,
  "batches": [
    {
      "updatedAt": "2017-03-13T10:06:48.341Z",
      "createdAt": "2017-03-13T10:06:48.341Z",
      "batchname": "rock",
      "activityname": "fit",
      "time": "1:30pm",
      "duration": "175min",
      "classtype": "demo",
      "trainer": "boby",
      "price": "4568",
      "_id": "58c66f3833a2171acc603482"
    }
  ]
}

那么，我想知道如何只打印没有子文档的父文档？

Answer 1

根据Mongoose documentation，你只需要添加第二个参数来指定应该返回哪个字段

router.get('/:userId', function (req, res, next) {
    User.findById(req.params.userId, {"batches": 0}, function (err, user) {
        if (err) throw err;
        res.json(user);
    });
});

我是否在nodejs应用程序中没有子文档的id检索父文档？

1 个答案: