Mongoose Trying to populate - node.js

Question

I have some issues
Cant populate CartProduct, just show the ObjectId.
There is way to make every time that CartProduct create, add automatically to? cart.
is this the right way of schemas structure?
Cart
const CartSchema = new Schema({
active: { type: Boolean, required: true, default: true },
createAt: { type: Date, default: Date.now },
client: { type: Schema.Types.ObjectId, ref: "User", required: true },
products: [{ type: Schema.Types.ObjectId, ref: "CartProduct" }],
});
const Cart = model("Cart", CartSchema);
Cart Product
const CartProductSchema = new Schema({
item: { type: Schema.Types.ObjectId, ref: "Product", required: true },
cart: { type: Schema.Types.ObjectId, ref: "Cart", required: true },
quantity: { type: Number, required: true },
totalPrice: { type: Number, required: true },
});
const CartProduct = model("CartProduct", CartProductSchema);
Product
const ProductSchema = new Schema({
name: { type: String, required: true },
price: { type: Number, required: true },
image: { type: String, required: true },
category: { type: Schema.Types.ObjectId, ref: "Category", require: true },
});
const Product = model("Product", ProductSchema);
Cart Controller
router.post("/", async (req, res) => {
try {
const { userId } = req.body;
const cart = await Cart.findOne({ client: userId
}).populate("CartProduct");
if (cart === null) {
const newCart = new Cart({
client: userId,
});
await newCart.save();
return res.status(201).send({ cart: newCart });
}
res.status(200).send({ cart });
} catch (error) {
res.status(500).send(error);
}
});
Add Product to Cart
router.post("/addProductToCart", async (req, res) => {
try {
const { item, cart, quantity, price } = req.body;
const newProduct = new CartProduct({
item,
cart,
quantity,
totalPrice: price * quantity,
});
await newProduct.save();
await Cart.findOneAndUpdate(
{ _id: cart },
{ $push: { products: newProduct } },
{
new: true,
}
);
res.status(201).send({ message: "New Product Added To Cart" });
} catch (error) {
res.status(500).send(error);
}
});
adding product to cart does working,
but populate not working
adding the output
{
"cart": {
"active": true,
"products": [
"602bc081daf867167c2eb5da"
],
"_id": "602aab802f625d1654805ef0",
"client": "601c50211c94cf5d642c67fb",
"createAt": "2021-02-15T17:12:32.997Z",
"__v": 0
}
}

Answer 1

your missing { in cartSchema
const CartSchema = new Schema({
active: { type: Boolean, required: true, default: true },
createAt: { type: Date, default: Date.now },
client: { type: Schema.Types.ObjectId, ref: "User", required: true },
products: [{ type: Schema.Types.ObjectId, ref: "CartProduct" }],
});
export the the models like this
module.exports = Cart
There is way to make every time that CartProduct create, add automatically to? cart
there is not a automatic way for adding new _id of CartProduct to collection, so you should use findOneAndUpdate() or find() and push in to products array and save()
is this the right way of schemas structure
yes, It is.
so for populate you can try:
let resultCarts = await Cart.find(filter).populate("products")
let resultProducts = await Product.find(filter).populate("category")
so change the CartProduct to products because you should pass name of field as a argument not name of schema
await Cart.findOne({ client: userId
}).populate("products");