节点js mongoose模型填充混乱

Question

我的方案是从模型1（employee.js）查询 getEmp_onId ，这将从模型2（empdetails.js）填充员工详细信息< /强>

问题：

当我在模型1（employee.js）上运行查询时，我获得员工数据，但其中没有填充数据

[
  {"_id": "552790d18d3a9810ee5c26c0",
    "username": "demo person"
    "email": "test@example.com"
  }
]

但令人震惊的是，当我直接在模型2（empdetails.js）上运行查询时，我从模型1（employee.js）获取填充数据!!

[
  {"_id": "552ca14069303a15eda1bc95",
    "emp_id": {
        "_id": "552790d18d3a9810ee5c26c0",
        "username": "demo person"
        "email": "test@example.com"
    },
    "city": "demo city",
    "state": "demo state",
    "country": "demo country"
  }
]

任何人都可以解释一下mongoose模型是如何填充作品的吗？

型号：1

employee.js
var mongoose = require('mongoose'); var Schema = mongoose.Schema;
var collection_name = 'employees';

var employee_schema = new Schema({
  _id: {type: Schema.ObjectId}, username: {type: String}, email: {type: String, unique: true},
  emp_details: {type: Schema.Types.ObjectId, ref: 'empdetails'}
});

employee_schema.methods = {
  getEmp_onId: function(empid, cb) {
    this.model(collection_name)
    .find({ _id: empid })
    .populate('emp_details')
    .exec(function(err, res) {
      if(err) { cb(err, null); }
      else { cb(null, res); }
    });
  }
};

型号：2

empdetails.js
var mongoose = require('mongoose'); var Schema = mongoose.Schema;
var collection_name = 'empdetails';

var schema = new Schema({
  _id: {type: Schema.ObjectId},
  emp_id: {type: Schema.Types.ObjectId, ref: 'employees'},
  city: {type: String}, state: {type: String}, country: {type: String}
});

schema.methods = {
  emp_details_by_id: function(empid, cb) {
    this.model(collection_name)
    .find({ emp_id: empid })
    .populate('emp_id')
    .exec(function(err, res) {
      if(err) { cb(err, null); }
      else { cb(null, res); }
    });
  }
};

Answer 1

我猜你是先保存员工，然后再用员工ID保存详细信息。这意味着，您的详细信息文档引用了员工文档，但员工文档没有参考。你应该这样做：

employee = new employee_model({username: 'username', email: 'email'});
details = new detail_model({emp_id: employee.id, city: 'City'});
employee.emp_details = details.id;
employee.save();
details.save();