Adding object into Array of of Objects, Nodejs, Mongoose - node.js

Question

I'm working on a small app where you can add products into a users cart.
I have a route set up for adding a specified product into a cart and that works fine. However when I add it in, all that shows up the array is the _id of the product, when what I'm looking for is an object containing some information (i.e, product name, product price, etc.). So that I can access it later in my React-Redux App. I've found a few suggestions online, but they either seem to not work for me at all or give me the same thing I've been getting.
Heres the route:
Cart.findOne({ user: req.user.id })
.then(cart => {
Product.findById(req.params.product_id).then(product => {
const newItem = {}
newItem._id = product._id;
newItem.name = product.name;
newItem.price = product.price;
const total =
parseFloat(cart.total) + parseFloat(product.price);
cart.total = Math.round(total*100)/100;
cart.items.push(newItem);
cart.save().then(cart=> res.json(cart));
});
})
.catch(err => res.status(404).json(err));
})
.catch(err => res.status(404).json(err));
Here's the corresponding Schema:
const CartSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: "users"
},
total: {
type: String,
default: 0
},
items: [
{
product: {
type: Schema.Types.ObjectId,
ref: "product"
}
}
]
});
Any help would be much appreciated.
Thank you

Answer 1

Try passing the product as is. Maybe because of the schema a Product is expected by mongoose, not a generic object such as, in your case, newItem
Cart.findOne({ user: req.user.id }).then(cart => {
return Product.findById(req.params.product_id);
}).then(product => {
const total = parseFloat(cart.total) + parseFloat(product.price);
cart.total = Math.round(total*100)/100;
cart.items.push(product);
return cart.save();
}).then(cart => {
return res.json(cart)
}).catch(err => res.status(404).json(err));
NOTE: i also fixed your promise chain structure a bit. This way you avoid callback hell, and only need one catch statement for the whole chain of promises.

Answer 2

How about
const CartSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: "users"
},
total: {
type: String,
default: 0
},
items: [
{
type: Schema.Types.ObjectId,
ref: "product"
}
]
});
And item pushed to array of items should be instance of Product, not just plain object.