Mongoose findById returns the empty doc - node.js

Question

I'm trying to implement CRUD operations using MEAN stack. I'm facing a problem on getting user by Id. It's showing the status true but it returns an empty document.
This is my model:
const userSchema = new mongoose.Schema({
fullName: {
type: String,
required: 'Full name can\'t be empty '
},
userName: {
type: String,
required: 'user name can\'t be empty ',
unique: true
},
email: {
type: String,
required: 'email can\'t be empty ',
unique: true
});
mongoose.model('User', userSchema);
in my controller:
const mongoose = require('mongoose');
const passport = require('passport');
var ObjectId = require('mongoose').Types.ObjectId;
const User = mongoose.model('User');
module.exports.getuser = (req, res, next) => {
if(!ObjectId.isValid(req.params.id))
return res.status(400).send(`No record with given id : ${req.params.id}`);
User.findById(req.params.id, (err, user) => {
if(!err){ res.status(200).json({status: true, user}); }
else{ console.log('Error in retriving User :' + JSON.stringify(err, undefined, 2)); }
});
}
This is the route:
router.get('/:id', jwtHelper.verifyJwtToken, ctrlUser.getuser);
while checking in the postman I'm getting status: true but it returns a blank document.
I'm not getting what's going on anyone please help.
Thanks in advance!!

Answer 1

There could be several reasons why you're not able to find and return a user. I'd go through this checklist to see what might be occurring:
When you define your schema the required field takes a boolean or a function, not a string. To be safe it would make sense to change your strings to true in order to make sure all new db records contain these fields. (https://mongoosejs.com/docs/schematypes.html#schematype-options)
When you import the model in your controller there is no need to call mongoose.model again; this step is performed in your model file. Make sure you're exporting the mongoose.model('User', userSchema) object in the model file/module and then do a normal const User = require(<pathToModelFile>); in the controller module.
If this still doesn't work...
You'll want to make sure your record is in fact saved in your db. Run a mongo shell in terminal by running $ mongo and use commands found here to use your db and search the User collection: https://docs.mongodb.com/manual/reference/mongo-shell/
This is how I would normally code my model and controllers (with routes):
Model file - Note you do need to require Mongoose
const mongoose = require('mongoose');
const userSchema = new mongoose.Schema({
fullName: {
type: String,
required: true
},
userName: {
type: String,
required: true,
unique: true
},
email: {
type: String,
required: true,
unique: true
});
module.exports = mongoose.model('User', userSchema);
Controller/Router -
const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const passport = require('passport');
const User = require('User');
router.get('/:id', jwtHelper.verifyJwtToken, async (req, res) => {
try {
const user = await User.findById(req.params.id);
res.status(200).json({status: true, user});
} catch (e) {
res.status(400).json({err: e});
}
});
module.exports = router;