first commit

BookHive/Endpoints/Authors/UpdateAuthorEndpoint.cs

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+using BookHive.DTO.Author;
+using BookHive.Models;
+using BookHive.Repositories;
+using BookHive.Specifications.Authors;
+using FastEndpoints;
+
+namespace BookHive.Endpoints.Authors;
+
+public class UpdateAuthorEndpoint(AuthorRepository authorRepository, AutoMapper.IMapper mapper) : Endpoint<UpdateAuthorDto>
+{
+    public override void Configure()
+    {
+        Put("/authors/{@Id}/", x => new { x.Id });
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(UpdateAuthorDto req, CancellationToken ct)
+    {
+        Author? author = await authorRepository.SingleOrDefaultAsync(new GetAuthorByIdSpec(req.Id), ct);
+        if (author is null)
+        {
+            await Send.NotFoundAsync(ct);
+            return;
+        }
+        
+        mapper.Map(req, author);
+        await authorRepository.SaveChangesAsync(ct);
+        await Send.OkAsync(cancellation: ct);
+    }
+}