尝试使用填充将两个子集合关联到父集合

Question

'我试图在医生集合中包含一组患者对象 ID 和一组数据（有关医生的信息）对象 ID。这是代码的开头，然后我迷路了。我想我想使用类似Doctor.find().populate('patients data') 的东西。那么如果有人能告诉我如何访问这些信息，那就太好了。

var express = require("express");
var app = express();
var mongoose = require("mongoose");

mongoose.connect("mongodb://localhost/population")

        var doctorSchema = new mongoose.Schema({
            name : String,
            patients : [{type : mongoose.Schema.Types.ObjectId, ref : "Patient"}],
            data : [{type : mongoose.Schema.Types.ObjectId, ref : "Data"}]
        })

        var patientSchema = new mongoose.Schema({
            name : String
        })
        var dataSchema = new mongoose.Schema({
            income : String
        })

        var Doctor = mongoose.model("Doctor",doctorSchema );
        var Patient = mongoose.model("Patient", patientSchema);
        var Data = mongoose.model("Data", dataSchema);

        var doc1 = new Doctor({"name" : "doc1"})
        doc1.save(doc1, function(err, doc){
            if(err){ 
                console.log(err)
            }else{
                console.log("saved")
            }

        })



app.listen(3000, function(){
    console.log("listening on 3000");
})

Answer 1

要访问信息，app 应该能够接收请求；需要在 app 对象上定义“get”方法：

app.get('/:id', function(req, res) {
  var doctorID = req.params.id;

  Doctor
    .findOne({_id: doctorID})
    .populate('patients data')
    .exec(function(err, doctor) {
      if (err) throw err;
      res.send(doctor);
    });
});