Retructured solution

LiteCharms.Features/Shop/ShoppingCarts/Queries/Handlers/GetCustomerShoppingCartsQueryHandler.cs

@@ -0,0 +1,30 @@
+using LiteCharms.Extensions;
+using LiteCharms.Features.Shop.Postgres;
+using LiteCharms.Features.Shop.ShoppingCarts.Models;
+using LiteCharms.Features.ShoppingCarts.Queries;
+
+namespace LiteCharms.Features.ShoppingCarts.Queries.Handlers;
+
+public class GetCustomerShoppingCartsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomerShoppingCartsQuery, Result<ShoppingCart[]>>
+{
+    public async ValueTask<Result<ShoppingCart[]>> Handle(GetCustomerShoppingCartsQuery request, CancellationToken cancellationToken)
+    {
+		try
+		{
+            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            if (!await context.Customers.AnyAsync(c => c.Id == request.CustomerId, cancellationToken))
+                return Result.Fail<ShoppingCart[]>(new Error($"Customer with Id {request.CustomerId} does not exist."));
+
+            var shoppingCarts = await context.ShoppingCarts.Where(sc => sc.CustomerId == request.CustomerId).ToArrayAsync(cancellationToken);
+
+            return shoppingCarts?.Length > 0
+                ? Result.Ok(shoppingCarts.Select(c => c.ToModel()).ToArray())
+                : Result.Fail<ShoppingCart[]>(new Error($"No shopping carts found for customer with Id {request.CustomerId}."));
+        }
+		catch (Exception ex)
+		{
+            return Result.Fail<ShoppingCart[]>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}