Question

我创建了一个集合，该值存储在mongodb中，如下所示。这是国家/地区集合

 "_id" : ObjectId("5b851243c8352016e4b70d36"),
 "is_active" : true,
 "country_code" : "IND",
 "country_name" : "India ",
 "__v" : 0

我想使用如下所示的国家/地区集合创建状态集合

"_id" : ObjectId("5b852a6e91088217804a1996"),
 "is_active" : true,
 "country_id" : "India",[here i want to fetch country collection _id(objectId)]
 "state_code" : "KA",
 "state_name" : "Karnataka",
 "__v" : 0

state.js：

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
var ObjectId = require('mongoose').Types.ObjectId

const State = new Schema({
    country_id:{
        type: mongoose.Schema.Types.ObjectId,
        ref:'Country'
    },
    state_code:String,
    state_name:String,
    is_active:{ type: Boolean, default:true, required: true },

});

module.exports = mongoose.model('State',State);

当我传递邮递员的值时，出现如下错误

"name": "CastError",
                "stringValue": "\"India\"",
                "kind": "ObjectID",
                "value": "India",
                "path": "country_id",

我正在传递要求，正文如下所示

"country_id":"India",
"state_code":"KA",
 "state_name":"Karnataka",
  "is_active":true,

在mongodb中有什么方法可以定义或访问外键吗？我仍然到处搜索错误

Answer 1

如下所述在文件中包含Objectid

var ObjectId = require('mongodb').ObjectID;

然后，您必须通过如下所述的req.body

"country_id": ObjectId("5b851243c8352016e4b70d36"),
"state_code":"KA",
"state_name":"Karnataka",
"is_active":true,

在路径\“ c_id \”“处将值\” In \“强制转换为ObjectID，

1 个答案: