Refactor all code

PyroFetes/Endpoints/PurchaseOrders/GetPurchaseOrderEndpoint.cs

@@ -1,7 +1,5 @@
 using FastEndpoints;
-using Microsoft.EntityFrameworkCore;
 using PyroFetes.DTO.PurchaseOrder.Response;
-using PyroFetes.DTO.PurchaseProduct.Response;
 using PyroFetes.Models;
 using PyroFetes.Repositories;
 using PyroFetes.Specifications.PurchaseOrders;
@@ -13,26 +11,24 @@ public class GetPurchaseOrderRequest
     public int Id { get; set; }
 }
 
-public class GetPurchaseOrderEndpoint(
-    PurchaseOrdersRepository purchaseOrdersRepository,
-    AutoMapper.IMapper mapper) : Endpoint<GetPurchaseOrderRequest, GetPurchaseOrderDto>
+public class GetPurchaseOrderEndpoint(PurchaseOrdersRepository purchaseOrdersRepository, AutoMapper.IMapper mapper) : Endpoint<GetPurchaseOrderRequest, GetPurchaseOrderDto>
 {
     public override void Configure()
     {
-        Get("/purchaseOrders/{@Id}", x => new {x.Id});
+        Get("/purchaseOrders/{@Id}", x => new { x.Id });
         AllowAnonymous();
     }
 
     public override async Task HandleAsync(GetPurchaseOrderRequest req, CancellationToken ct)
     {
-        PurchaseOrder? purchaseOrder = await purchaseOrdersRepository.FirstOrDefaultAsync(new GetPurchaseOrderByIdSpec(req.Id), ct);
+        PurchaseOrder? purchaseOrder = await purchaseOrdersRepository.SingleOrDefaultAsync(new GetPurchaseOrderByIdSpec(req.Id), ct);
 
-        if (purchaseOrder == null)
+        if (purchaseOrder is null)
         {
             await Send.NotFoundAsync(ct);
             return;
         }
-        
+
         await Send.OkAsync(mapper.Map<GetPurchaseOrderDto>(purchaseOrder), ct);
     }
 }