Mongo populate not working and not retrieve data model - node.js

Question

I have a problem in populate method in mongodb it can't retrieve data from model. Can anyone help me solve that problem?
This is the code
router.get('/', auth, async (req, res) => {
try {
const user = req.user._id;
const wishlist = await Wishlist.find({ user, isLiked: true })
.populate({
path: 'Products',
select: 'title',
})
.sort('-updated');
res.status(200).json({
wishlist,
});
} catch (error) {
res.status(400).json({
error: 'Your request could not be processed. Please try again.',
});
}
});
When I navigate to http://localhost:3000/wishlist/, this is the response I get:
{
"wishlist": [
{
"product": "60cb5eb82cc7091ae2e31c88",
"user": "60cb6c46291247466fe08f92",
"isLiked": true,
"_id": "60d1a656567e08bf89571209",
"updated": "2021-06-22T10:09:25.295Z",
"created": "2021-06-22T08:59:02.434Z",
"__v": 0
}
]
}
The model of products
const mongoose = require('mongoose');
const { Schema } = mongoose;
const ProductSchema = mongoose.Schema({
title: {
type: String,
required: true,
},
description: {
type: String,
required: true,
},
category:{
type: Schema.Types.ObjectId,
ref: 'Categories',
default: null
},
photo: { type: String, required: true },
createdAt: {
type: Date,
default: new Date(),
},
updateAt: Date,
price: {
type: String,
required: true,
},
quantity: {
type: Number
}
,
isActive: {
type: Boolean,
default: true
},
user: {
type: Schema.Types.ObjectId,
ref: "User",
}
});
module.exports = mongoose.model('Product', ProductSchema);
The model for wishlist:
const Mongoose = require('mongoose');
const { Schema } = Mongoose;
// Wishlist Schema
const WishlistSchema = new Schema({
product: {
type: Schema.Types.ObjectId,
ref: 'Product',
default: null,
},
user: {
type: Schema.Types.ObjectId,
ref: 'User',
default: null,
},
isLiked: {
type: Boolean,
},
updated: {
type: Date,
default: Date.now,
},
created: {
type: Date,
default: Date.now,
},
});
module.exports = Mongoose.model('Wishlist', WishlistSchema);
Can anyone help me please to find the solution for that problem?