Why is the hotel's Object _id not saved in MongoDB?

Question

How to fix this error? The following is the HotelRoom module

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const HotelRoomSchema = new Schema({
    name : {
        type : String,
        require : true
    },
    numberofRooms : {
        type : Number,
        require : true
    },
    typeOfBeds : {
        type : String,
        require : true
    },
    noOfBeds : {
        type : Number,
        require : true
    },
    sleepers : {
        type : Number,
        require : true
    },
    view : {
        type : String,
        require : true
    },
    area : {
        type : Number,
        require : true
    },
    price : {
        type : Number,
        require : true
    },
    hotel : {
        type :Schema.Types.ObjectId ,ref:"Hotel",require:true
    }
})

const HotelRoom = mongoose.model("HotelRoom",HotelRoomSchema);

module.exports = HotelRoom;

/////////This is routing

router.route("/:hotelId/addroom").post((req,res) =>{

    let hotelId = req.params.id;
    const name = req.body.name;
    const numberofRooms = Number(req.body.numberofRooms);
    const typeOfBeds = req.body.typeOfBeds;
    const noOfBeds = Number(req.body.noOfBeds);
    const sleepers = Number(req.body.sleepers);
    const view = req.body.view;
    const area = Number(req.body.area);
    const price = Number(req.body.price);

    const newRoom = new HotelRoom({
 
        name,
        numberofRooms,
        typeOfBeds,
        noOfBeds,
        sleepers,
        view,
        area,
        price,
        hotelId
    })

    newRoom.save().then(()=>{
        res.json("New Room Added")
    }).catch((err)=>{
        console.log(err);
    })
})

//// This is the value of Postman http://localhost:8070/hotel/6432d331380ef51c5e992af1/addroom

{
  "name": "豪华套房",
  "numberofRooms": 10,
  "typeOfBeds": "大床",
  "noOfBeds": 2,
  "sleepers": 2,
  "view": "海景",
  "area": 60,
  "price": 200
}

This is the content saved on MongoDB _id : ObjectId('643662e1e5b1f15e6720c1be') name: "Deluxe Suite" Number of rooms: 10 typeOfBeds : "Queen bed" Number of beds: 2 Sleepers : 2 view : "sea view" Area: 60 Price: 200 __v 0

I need to save the hotelId into the database

Answer 1

Find the answer let hotel = req.params.id; needs to be modified to

let hotel = req.params.hotelId;