MongoDB doesn't insert nested document

Question

So I'm trying to insert a nested document here. books contains multiple book but it doesn't insert a title, only auto generated _id.

here's my code inserting a data:

"firstName": "Jay Rhick",
"lastName": "Villareal",
"country": "Philippines",
"citizenship": "Filipino",
"books": [{
    "book": "Harry Pota"
}]

and here's the output:

{
"_id": "6053fc2f33325b35305ee764",
"firstName": "Jay Rhick",
"lastName": "Villareal",
"country": "Philippines",
"citizenship": "Filipino",
"books": [
    {
        "_id": "6053fc2f33325b35305ee765"
    }
],
"__v": 0

Here's my Schema:

const mongoose = require('mongoose')
const BookSchema = require('./BookSchema').schema

const PostSchema = mongoose.Schema({
    firstName: String,
    lastName: String,
    citizenship: String,
    country: String,
    books: [BookSchema]
})

module.exports = mongoose.model('PostSchema', PostSchema)

here's my book schema

const mongoose = require('mongoose')

const BookSchema = mongoose.Schema({
     book: String
})

module.exports = mongoose.model('BookSchema', BookSchema)

and here's my express routes

const express = require('express')
const router = express.Router()
const Post = require('../models/Post')

router.post('/', async (req, res) => {
    const post = new Post({
        firstName: req.body.firstName,
        lastName: req.body.lastName,
        country: req.body.country,
        citizenship: req.body.citizenship,
        books: [{
            book: req.body.book
        }]
    })
    try{
        const savedPost = await post.save()
        res.json(savedPost)
    }catch(err){
        res.json({ message: err })
    }
})

module.exports = router

If your question seems to be answered, please don't forget to update it, and mark it as solved. — AlexZeDim
– AlexZeDim, Commented Mar 19, 2021 at 6:16

asg86260 · Accepted Answer · 2021-03-19 01:43:54Z

1

Since its a nested schema, it might not be returning the whole object, just the _id. Can you see the book with the title in your collection? If it is in the collection, you'll want to take a look at the .populate() function in mongoose.

heres a similar stackoverflow question: Populate nested array in mongoose

answered Mar 19, 2021 at 1:43

asg86260

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7 Comments

Jay Rhick Over a year ago

how can i use populate? im using Postman to insert and fetch data from the server

asg86260 Over a year ago

do you have a GET endpoint for this collection? Or are you just looking at the returned object from the POST?

Jay Rhick Over a year ago

im trying to insert a book title but it doesn't seems to work, it only shows the _id as it shown above, I also checked the database at atlas mongodb, same output, it doesn't insert a book, only auto generated id

Jay Rhick Over a year ago

Thank you so much! You gave me idea to solve this problem! Thank youuuu

Jay Rhick Over a year ago

i will post the answer :)

|

AlexZeDim · Accepted Answer · 2021-03-20 01:27:29Z

0

I solved my problem thanks to asg86260! So I have changed my code from:

  books: [{
    book: req.body.book
  }]

to books: req.body.books

edited Mar 20, 2021 at 1:27

AlexZeDim

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answered Mar 19, 2021 at 2:26

Jay Rhick

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