What is the process for deducting the ordered quantity from the available quantity once an order is confirmed

Although I'm not a fan of hard coding, I've been struggling to find a solution to my problem and some explanations are just not clicking for me.

The issue at hand involves three data products in the cart, product details, and placed order data from firestore. My goal is to decrease the available quantity from the product details based on the products in the cart, and then update the available quantity in the firestore.

Product in the cart data:

var  Cart= [{
  ProdName : "Smartphone",
  ProdID  : "0n7TZQrgpbfs8hPDKc7n",
  ProductQuantity : 2,
  ProductPrice  : 1500
},{
  ProdName : "Charger",
  ProdID  : "11VOxRvH2dc8cxyR4AYG",
  ProductQuantity : 1,
  ProductPrice  : 600
}];

Product details data

  var  Products= [{
      Name : "Smartphone",
      ID  : "0n7TZQrgpbfs8hPDKc7n",
      AvailableQuantity : 100,
      Price  : 1500,
      Category : "Tech"
    },{
      Name : "Charger",
      ID  : "11VOxRvH2dc8cxyR4AYG",
      AvailableQuantity : 150,
      Price  : 600,
      Category : "Tech"
    }];

Placed order Data

  var  Order= {
      UserName : "Rakesh",
      UserID  : "CcojGJPh3mIyoCZmParw",
      OrderID :"H2Fbh3jTQ2XL7B9ttXBz",
      UserPhone : 9840184150,
      PlacedDate: "date",
      ProductsPlaced : [
       {
        ProdName : "Smartphone",
        ProdID  : "0n7TZQrgpbfs8hPDKc7n",
        ProductQuantity : 2,
        ProductPrice  : 1500
        },{
        ProdName : "Charger",
        ProdID  : "11VOxRvH2dc8cxyR4AYG",
        ProductQuantity : 1,
        ProductPrice  : 600
        }
      ]
        };
javascriptfirebasevue.jsgoogle-cloud-firestore

Answer №1

If you want to ensure accurate order processing, make sure to follow these steps:

Order.ProductsPlaced.forEach( item => { 
  console.log(item); 
  var index = Products.findIndex( product => product.ID === item.ProdID); 
  if (index < 0) {
    console.log("Index Not Found"); 
    return; 
  } 
  Products[index].AvailableQuantity =  Products[index].AvailableQuantity - item.ProductQuantity;
});

It's important to double-check the availability of products before subtracting quantities from the inventory. Make sure that items in the cart have sufficient stock levels to fulfill the order.

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