Hello Vinayak 

Sorry, I haven't checked the OML you have attached. But here is a solution might help you. 

You can look into Traditional eCommerce Sample which has Add To Cart Functionality and Payment Integration Too. 

Though it is build on old UI. So, please don't include this in your current app but take the reference of how Add To Cart is developed. 

I hope this will help you. 

Hello Vinayak,

I have gone Through your Oml and Made a few Modifications in the Add To Cart Action and Shopping Cart Preparation and i post your edited oml here.

All you need To Do is clear the Existing errors (You can Add Some of your own more actions into preparation) And Make Changes in your Screen To Match the Data Receiving on the Local Variable(User Products) I have created for you.

I did that to my app. So first, you need to have the tables for that

This is what I have in my application, where you have the shopping list and the product. This list's relationship is many to many. A shopping list has a lot of products, and a product can be in a lot of shoppingLists. And that's why you have a third table to save this interaction, the ShoppingListProducts.

Another thing is that a shoppingList needs to be related to a User, and that's why you have the Shared ShoppingUsers.

So with all this things, you can manage everything, you just need to list all the shoppinglist the user have, if you want to see the products to that shoppinglist you jsut need to pass the shoppinglistId, and you can also know the quantity.

Every ShoppingListProducts has is own quantity as you can see on the diagram, its a way of seeing and add.

Have a look to in this application!!

https://www.outsystems.com/forge/component-overview/4962/shopping-list

It covers a lot

Best Regards,

Márcio 

Hello Vinayak,

Please find attached the updated OML. 

1. I have added the logic on the ProductDetail Screen to add the record on the AddToCart button.

2. This record will appear on the ShoppingCart screen where you can go from the link View Cart available on the FourColumnGallery screen.

3. In the ShoppingCart screen you can add/remove the quantity of the products and the sub total will get updated based on the add/remove the quantity.

Please review the OML and let me know, if you need any other  help.

Thanks & Kind Regards,

Sachin