errors in Cart Count update, items not adding Cart, and Cart Total is not updating

Hi,@Thibaut Fabrice.

Fixed the problem that shopping cart cannot add items.

1.Added string.Empty.

2.Added [FromBody].

Fix the problem that discount coupons cannot be used.

1.Delete asp-route-cartDto="@Model", modify Remove Coupon to RemoveCoupon.

2.Add code.

Related code.

        private readonly ICartService _cartService;
        private readonly ICouponService _couponService;
        private readonly IOrderService _orderService;
        public CartController(ICartService cartService, IOrderService orderService,ICouponService couponService)
        {
            _cartService = cartService;
            _orderService = orderService;
            _couponService = couponService;
        }

Related code(After using the coupon, I changed the total price. If you don't need it, you could delete the code of the /.../ package.)

private async Task<CartDto> LoadCartDtoBasedOnLoggedInUser()
{
    var userId = User.Claims.Where(u => u.Type == JwtRegisteredClaimNames.Sub)?.FirstOrDefault()?.Value;
    ResponseDto? response = await _cartService.GetCartByUserIdAsnyc(userId);
    if (response != null && response.IsSuccess)
    {
        CartDto cartDto = JsonConvert.DeserializeObject<CartDto>(Convert.ToString(response.Result));
        if(!string.IsNullOrEmpty(cartDto.CartHeader.CouponCode))
        {
            ResponseDto couponResponse = await _couponService.GetCouponAsync(cartDto.CartHeader.CouponCode);
            CouponDto couponDto = JsonConvert.DeserializeObject<CouponDto>(couponResponse.Result.ToString());
            cartDto.CartHeader.Discount = couponDto.DiscountAmount;
            /*******************  Calculate the total price after discount  **********************************/
            if (cartDto.CartHeader.CartTotal - cartDto.CartHeader.Discount>=0)
            {
                cartDto.CartHeader.CartTotal = cartDto.CartHeader.CartTotal - cartDto.CartHeader.Discount;
            }  
            else {
                cartDto.CartHeader.CartTotal = 0;
            }
            /****************************************************/
        }               
        return cartDto;
    }
    return new CartDto();
}

Run the projectLet Visual Studio 2022 run multiple projects at the same time.

After configuration, click Start to run.

Operation Results.

1.Add to Cart

2.Use coupon

If you still cannot achieve the desired effect after modification, you could further describe the problem after modification.

Thanks,its working.MinAmount should be applied.Discount should be applied automaticatically when >=MinAmount form table database:

CouponId CouponCode DiscountAmount MinAmount

1 100FF 10 20

2 200FF 10 40

Any help,

Thanks,

Fabrice

Hi,@Thibaut Fabrice.

Could you explain the current problem in more detail?

ok,the discount should be applied only when the Order Total is at least 20 for 100FF and the discount should be 10.for example if its 13.99 the discount is not applied even when applied. it should be applied only when at least 20.Same for 200FF.

Also when increase the price the discount shall be applied automatically only when at least the price is MinAmount that is 20,that is Order Total is 20 minimum.

Any help,

Thank you,

Fabrice

Hi,@Thibaut Fabrice.

You could adjust the execution logic of the code here.

Related code

private async Task<CartDto> LoadCartDtoBasedOnLoggedInUser()
{
    var userId = User.Claims.Where(u => u.Type == JwtRegisteredClaimNames.Sub)?.FirstOrDefault()?.Value;
    ResponseDto? response = await _cartService.GetCartByUserIdAsnyc(userId);
    if (response != null && response.IsSuccess)
    {
        CartDto cartDto = JsonConvert.DeserializeObject<CartDto>(Convert.ToString(response.Result));
        if (!string.IsNullOrEmpty(cartDto.CartHeader.CouponCode))
        {
            ResponseDto couponResponse = await _couponService.GetCouponAsync(cartDto.CartHeader.CouponCode);
            CouponDto couponDto = JsonConvert.DeserializeObject<CouponDto>(couponResponse.Result.ToString());
            if(cartDto.CartHeader.CartTotal>= couponDto.MinAmount)
            {
                cartDto.CartHeader.Discount = couponDto.DiscountAmount;                       
            }
            else
            {
                cartDto.CartHeader.Discount = 0;
            }

            cartDto.CartHeader.CartTotal = cartDto.CartHeader.CartTotal - cartDto.CartHeader.Discount;
        }
        return cartDto;
    }
    return new CartDto();
}

Thank you very much,

Fabrice

Hi,@Thibaut Fabrice.

Is there any update to the question? Did my answer solve your problem? If so, you could accept it as the answer. It's helpful for community members with related questions.

Thank you,

hi,its working but I need also the Discount to be also appearing in ShoppingCartAPI

Discount is not applying in the above screenshot even when applied Discount.

Still 43.99.Should be Order Total =Rs33.99 and Order Discount =10;

for second screenshot.

First screenshot is working fine.

Any help,

Fabrice

Can you solve it?

Thanks,

Fabrice

Can you help me as I'm stuck with second screenhot for ShoppingCartAPI for discount not appearing and and Order Total fot this screenshot despite discount apply.

Any help,

Awaiting your reply,

Fabrice

Hi,@Thibaut Fabrice.

I'm investigating, please wait.

Hi,@Thibaut Fabrice.

Restore the previous two changes.

Add code.

Related code

public async Task<ResponseDto> GetCart(string userId)
{
    try
    {
        CartDto cart = new()
        {
            CartHeader = _mapper.Map<CartHeaderDto>(_db.CartHeaders.First(u => u.UserId == userId))
        };
        cart.CartDetails = _mapper.Map<IEnumerable<CartDetailsDto>>(_db.CartDetails
            .Where(u => u.CartHeaderId == cart.CartHeader.CartHeaderId));

        IEnumerable<ProductDto> productDtos = await _productService.GetProducts();

        foreach (var item in cart.CartDetails)
        {
            item.Product = productDtos.FirstOrDefault(u => u.ProductId == item.ProductId);
            cart.CartHeader.CartTotal += (item.Count * item.Product.Price);
        }

        CouponDto couponDto =await _couponService.GetCoupon(cart.CartHeader.CouponCode);
        if (cart.CartHeader.CartTotal >= couponDto.MinAmount)
        {
            cart.CartHeader.Discount = couponDto.DiscountAmount;
        }
        else
        {
            cart.CartHeader.Discount = 0;
        }

        cart.CartHeader.CartTotal = cart.CartHeader.CartTotal - cart.CartHeader.Discount;
        _response.Result = cart;
    }
    catch (Exception ex)
    {
        _response.IsSuccess = false;
        _response.Message = ex.Message;
    }
    return _response;
}

Related code

public class CouponService : ICouponService
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly IHttpContextAccessor _accessor;


    public CouponService(IHttpClientFactory ClientFactory, IHttpContextAccessor accessor)
    {
        _httpClientFactory = ClientFactory;
        _accessor = accessor;
    }

    public async Task<CouponDto> GetCoupon(string couponCode)
    {
        var client = _httpClientFactory.CreateClient("Coupon");
        var token = await _accessor.HttpContext.GetTokenAsync("access_token");
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
        var response = await client.GetAsync($"/api/coupon/GetByCode/{couponCode}");           
        var apiContet = await response.Content.ReadAsStringAsync();
        var resp = JsonConvert.DeserializeObject<ResponseDto>(apiContet);
        if (resp!=null && resp.IsSuccess)
        {
            return JsonConvert.DeserializeObject<CouponDto>(Convert.ToString(resp.Result));
        }
        return new CouponDto();
    }
}

hi,I have implemented the codes.

still not displaying the discount.Can you give a screenshot of you working for ShoppingCartAPI.When applied 100FF the discount is 10 but it still cartTotal:30 and discount:0 should be 10.cart total should be 20 as below screenshot.

Any help.

Awaiting your reply,

Thanks,

Fabrice

the screenshot is where the discount 10 was not applied for 100FF .

Screenshot same as above.

Any help,

Fabrice

I have updated my Github link with the codes you provided me.

Check it and revert to me for the ShoppingCartAPI.

https://github.com/Thibaut501/Mango

Awaiting your reply,

Thanking you,

I'm stuck.

still Discount is still zero even applied 100FF or 200FF coupon Code as in the screenshot.

Regards,

Fabrice

Hi,@Thibaut Fabrice.

The current situation is correct. This is because the user has no login record, so the Token is not obtained when executing await _accessor.HttpContext.GetTokenAsync("access_token");, causing the following network request to fail.

You could directly give a correct Token, that is, modify the following code.

//var token = await _accessor.HttpContext.GetTokenAsync("access_token");
var token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6IjEyMyIsInN1YiI6IjgzOGIyMzUyLTUzYTMtNGQ4Zi1hMjdmLTE4NWUzOTIzOWU4OCIsIm5hbWUiOiIxMjMiLCJyb2xlIjoiQURNSU4iLCJuYmYiOjE3MzAzNjAyNjYsImV4cCI6MTczMDk2NTA2NiwiaWF0IjoxNzMwMzYwMjY2LCJpc3MiOiJtYW5nby1hdXRoLWFwaSIsImF1ZCI6Im1hbmdvLWNsaWVudCJ9.Ug9E-xmZvMOQjDtlMY9JpI6yynLGkJqylnW9m0rRrjc";

Operation Results(Original total price: 40)： However, if users could get the correct results directly through the API without logging in, this would be unsafe, so it is not recommended.

Thank you its working,

Regards,

Fabrice

Hi,@Thibaut Fabrice.

Are there any more updates to this question? Is my answer helpful to you? If the above reply could solve your problem, you could accept it as the answer. This will help more community members who have similar problems.

Hi, codes working fine but coupon no more applied and not displayed also in ShoppingCartAPI.

Any help,

Thanks,

Fabrice from screenshot:

despite applied 100FF and 200FF.

Also for:

my github link:https://github.com/Thibaut501/Mango

Any help despite add token,

Can you verify my codes and fins the error and provide the solutions.

Awaiting your reply,

Best Regards,

Fabrice

Hi,@Thibaut Fabrice.

You need to use your own token, not the one I gave you.

You could query your Token in the following ways:

After logging in, open the panel by pressing F12 on your keyboard before clicking on the shopping cart.

Select Network and find the network request to get the shopping cart (CartIndex).

Click the CartIndex network request and find JWTToken in Headers. The token value you need to replace is behind it.

hi,where to generate the tokens?

Awaiting your reply,

Thanks,

Fabrice

I used the var token = "ABPQuE_u3YMamA9FD7aSuunvwJk2bJaSNNn8K1Ef"; Generate token from API tokens:

But still same error.

Any help,

Awaiting your reply,

Best Regards,

Fabrice

Hi,@Thibaut Fabrice.

Have you tried the method I gave to get the Token from the network request?

If you have any doubts about what I described, you could clearly point it out.