Adding coupon code to cart doesn't work

[azapotoczny-forte]

When adding the coupon to the shopping cart using CartModuleController.AddCartCoupon, the coupon code is not saved in the database.

I checked the code and it looks like ShoppingCartBuilder sets the property value ShoppingCart.Coupon. However, the conversion to the entity loses that value in the method ShoppingCart.FromModel:

if (model.Coupon != null)
{
   // The coupon code is stored in the Coupons collection
    Coupons = new ObservableCollection<CouponEntity>(new[] { new CouponEntity { Code = model.Coupon } });
}

if (model.Coupons != null)
{
   // The coupon code save above is erased by the line below
    Coupons = new ObservableCollection<CouponEntity>(model.Coupons.Select(x => new CouponEntity { Code = x }));
}

[Dan-BV]

Hello, @azapotoczny-forte !
Thank you for your appeal.
The above code is legacy code. To implement the functionality you need, we can recommend two ways:

1. Using the API, in order to apply coupons, you need to implement saving the cart manually.
2. Use the XAPI https://github.com/VirtoCommerce/vc-module-experience-api/blob/dev/src/XPurchase/VirtoCommerce.XPurchase/Commands/AddCouponCommandHandler.cs#L16.
   It contains business operations and covers your scenario and is already integrated with the B2B Theme.

[azapotoczny-forte]

Hi @Dan-BV, when it comes to the first solution, do you mean just adding a coupon code to the cart and saving the whole cart object, right?