Add or create document in nested array mongoose

durrp.js

const Cart = require('../models/cart.model')
// returns ObjectId or null
const { parseObjectId } = require('../utils/validateObjectId')

async function addOrCreateNestedItem(newItem) {
  try {
    const cart = await Cart.findOne(
      {
        _id: '618018504bb0eb2bdf6f2955',
      })

    const targetItem = cart.items.find(item => {
      return item.product_id.equals(parseObjectId(newItem.product_id))
    })

    if (targetItem) {
      targetItem.amount = newItem.amount
    } else {
      cart.items.push(newItem)
    }

    cart.markModified('items')
    const newCart = await cart.save()
    console.log("🚀 ~ file: testAddOrEditItem.js ~ line 24 ~ main ~ newCart", newCart)
  } catch (error) {
    console.log("🚀 ~ file: testAddOrEditItem.js ~ line 26 ~ main ~ error", error)
  }
}

// example use
addOrCreateNestedItem({
      product_id: '617fe683974a15542b747ca1',
      amount: 66
    })