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The question is published on by Tutorial Guruji team.
I cannot update my collection even without encountering any error. Can someone help? Please I am troubleshooting this for like 3 hours now.
const product_id = req.body.cartItems.product_id;
const item = cart.cartItems.find(c => c.product_id == product_id);
if (item) {
Cart.findOneAndUpdate({ "user": req.user._id, "cartItems.product_id" : product_id }, {
"$set": {
"cartItems.$":{
...req.body.cartItems.quantity,
quantity: item.quantity + req.body.cartItems.quantity
}
}
})
.exec((error, _cart) => {
if (error) return res.status(400).json({ error });
if (_cart) {
return res.status(201).json({ _cart });
}
});
The MODEL:
const mongoose = require('mongoose');
const cartSchema = new mongoose.Schema({
user: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true},
cartItems: [
{
product_id: { type: mongoose.Schema.Types.ObjectId, ref: 'Product', required: true}, // This foreign key to product _id
quantity: {type: Number,required: true},
price: {type: Number, required: true}
}
]
}, {timestamps: true});
module.exports = mongoose.model('Cart', cartSchema);
Answer
You need to use the $[] operator to update all documents inside the cartItems array matching your filter criteria. This operator acts like a placeholder for all items in the array. Considering your coding it would be something like this:
Cart.findOneAndUpdate({ "user": req.user._id, "cartItems.product_id" : product_id }, {
"$set": {
"cartItems.$[].quantity": item.quantity + req.body.cartItems.quantity
}
}).exec(...)
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