Mongoose/Express population issue - node.js

Question

Here are my schemas:
1.The Records schema:
const mongoose = require('mongoose')
const RecordsSchema = new mongoose.Schema({
Title: { type: String, required: true },
postedby: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'user'
}],
Author: { type: String, required: true },
ISBN: { type: String, required: true },
Review: { type: String },
SelectedFile: { type: String },
Likes: { type: Number, default: 0 },
Date: { type: Date, default: Date.now() }
});
module.exports = Records = mongoose.model('record', RecordsSchema, 'record');
Here is the The user Schema:
const mongoose = require('mongoose')
const userSchema = new mongoose.Schema({
username: { type: String },
email: { type: String, required: true, unique: true },
records: [{
type: [mongoose.Schema.Types.ObjectId],
ref: 'record'
}],
password: { type: String, required: true },
Date: { type: Date, default: Date.now(), immutable: true }
});
module.exports = User = mongoose.model('user', userSchema, 'user');
The express route for getting a record:
router.get('/postedby/', (req, res) => {
Records.findOne()
.populate('postedby')
.exec()
.then(post => {
if (!post) {
return res.status(400).json({ msg: 'Add Posts' });
}
else return res.json(post);
}).catch(err => console.error(err))
});
Result of the route:
{
"postedby": [],
"Likes": 0,
"_id": "5fed8c12a4fb2c1e98ef09f6",
"Title": "New Age",
"Author": "Situma Prisco",
"ISBN": "23422",
"SelectedFile": "",
"Review": "",
"Date": "2020-12-31T08:30:10.321Z",
"__v": 0
},
I'm getting a blank Array on the populated user field(posteddby) .
Please help, What am I doing wrong? And yes, i do have a User Logged in

Answer 1

I implemented your code and Schemas, It's work for me, if you stored data correctly in the database, every things will be ok...
note :
please use find({}) instead of findOne() if data is not displayed again for postedby key, Other issues need to be addressed like mongoose version and ..., because your code and schemas is correct
it's result for me with find({}):
[
{
"postedby": [
{
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a#test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
}
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bca1f1045a4f102bc0ce",
"Title": "farsi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
},
{
"postedby": [
{
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a#test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
}
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bca5f1045a4f102bc0cf",
"Title": "farsi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
},
{
"postedby": [
{
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a#test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
}
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bcb3f1045a4f102bc0d0",
"Title": "riyazi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
},
{
"postedby": [
{
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a#test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
}
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bcc7f1045a4f102bc0d1",
"Title": "zaban",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
},
{
"postedby": [
{
"records": [
"5ff6c275964d062f045e93d3",
"5ff6c283964d062f045e93d5"
],
"_id": "5ff6c253964d062f045e93d2",
"Date": "2021-01-07T08:01:21.499Z",
"email": "b#test.com",
"password": "$2a$12$jmHUrTSPwjaVd0VEIpsGauExHNSukHRyWWiJt4UlEgeWLBo8GPDH.",
"__v": 2
}
],
"Likes": 1,
"Date": "2021-01-07T08:01:21.990Z",
"_id": "5ff6c275964d062f045e93d3",
"Title": "zaban",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
},
{
"postedby": [
{
"records": [
"5ff6c275964d062f045e93d3",
"5ff6c283964d062f045e93d5"
],
"_id": "5ff6c253964d062f045e93d2",
"Date": "2021-01-07T08:01:21.499Z",
"email": "b#test.com",
"password": "$2a$12$jmHUrTSPwjaVd0VEIpsGauExHNSukHRyWWiJt4UlEgeWLBo8GPDH.",
"__v": 2
}
],
"Likes": 1,
"Date": "2021-01-07T08:01:21.990Z",
"_id": "5ff6c283964d062f045e93d5",
"Title": "tttt",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
}
]