How do I update nested array values in mongoose?

Question

I am fairly new to nodejs/express and I'm practicing full stack development with devchallenges.io, i'm doing the shoppingify challenge. I'm trying to update the quantity of an item I am targeting inside of the items array. I understand my attempt below was terrible, I'm really struggling to understand the logic to be able to do so.

// @route PUT api/list/item/quantity/:id
// @desc Increase or decrease quantity
// @access Private
router.put('/item/quantity/:id', auth, async (req, res) => {
 const { action } = req.body;
 try {
 let list = await List.findOne({ user: req.user.id });
 const item = list.items.find(
 (item) => item._id.toString() === req.params.id
 );
 list = list.updateOne(
 { 'items._id': req.params.id },
 { $set: { 'items.quantity': item.quantity + 1 } }
 );
 await list.save();
 return res.json(list);
 } catch (error) {
 console.error(error.message);
 res.status(500).send('Server Error');
 }
});

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const ListSchema = new Schema({
 user: {
 type: Schema.Types.ObjectId,
 },
 name: {
 type: String,
 default: 'Shopping List',
 },
 items: [
 {
 name: {
 type: String,
 default: '',
 },
 note: {
 type: String,
 default: '',
 },
 image: {
 type: String,
 default: '',
 },
 category: {
 type: String,
 default: '',
 },
 quantity: {
 type: Number,
 default: 1,
 },
 },
 ],
 date: {
 type: Date,
 default: Date.now,
 },
});
module.exports = List = mongoose.model('list', ListSchema);

Answer 1

Look this is my update-vendor route here I'm updating nested street and city name.

router.put("/update-vendors", async (req, res, next) => {
 const vendor = await Vendor.updateOne(
 {
 "address.street": "Street2",
 },
 {
 $set: {
 "address.$.street": req.body.street,
 "address.$.city": req.body.city,
 },
 }
 );
 res.status(200).json(vendor);
});

You can update particular things with the help of $set and other $push method

• Ope Afolabi: You're a lifesaver, thanks :)
• Smit Gajera: Great, I glad to see this work for you need more help just let me know