Added ViewComponentRenderer

HotwiredBooks/Components/ViewComponentRenderer.cs

@@ -0,0 +1,50 @@
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using Microsoft.AspNetCore.Mvc.ViewEngines;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+
+namespace HotwiredBooks.Components;
+
+public sealed class ViewComponentRenderer(ActionContext context, ITempDataProvider tempDataProvider)
+{
+    public async Task<IActionResult> RenderAsync(string viewComponentName, object viewModel)
+    {
+        var viewData = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary())
+        {
+            Model = viewModel
+        };
+
+        await using var writer = new StringWriter();
+
+        var viewContext = new ViewContext(
+            context,
+            new NullView(),
+            viewData,
+            new TempDataDictionary(context.HttpContext, tempDataProvider),
+            writer,
+            new HtmlHelperOptions()
+        );
+
+        var viewComponentHelper = context.HttpContext.RequestServices.GetRequiredService<IViewComponentHelper>();
+        (viewComponentHelper as IViewContextAware)?.Contextualize(viewContext);
+
+        var viewComponent = await viewComponentHelper.InvokeAsync(viewComponentName, viewModel);
+        viewComponent.WriteTo(writer, HtmlEncoder.Default);
+
+        await writer.FlushAsync();
+        return new ContentResult
+        {
+            Content = writer.ToString(),
+            ContentType = "text/html"
+        };
+    }
+
+    private sealed class NullView : IView
+    {
+        public string Path => string.Empty;
+
+        public Task RenderAsync(ViewContext context) => Task.CompletedTask;
+    }
+}

HotwiredBooks/Controllers/BooksController.cs

@@ -4,14 +4,18 @@
 using HotwiredBooks.Models;
 using HotwiredBooks.ViewModels;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
 using MonadicBits;
 
 namespace HotwiredBooks.Controllers;
 
-public sealed class BooksController(IBooksRepository booksRepository) : Controller
+public sealed class BooksController(IBooksRepository booksRepository, ITempDataProvider tempDataProvider)
+    : Controller
 {
     private record FormData(string Title, string Author);
 
+    private ViewComponentRenderer ViewComponentRenderer => new(ControllerContext, tempDataProvider);
+
     [HttpGet]
     public async Task<IActionResult> Index() => View(new BooksIndexViewModel(
         (await booksRepository.All()).OrderByDescending(book => book.CreatedAt)));
@@ -41,7 +45,6 @@ public Task<IActionResult> Edit(Guid id) =>
 
     [HttpPatch, HttpPut]
     [ValidateAntiForgeryToken]
-    [TurboStreamResponse]
     public Task<IActionResult> Update(Guid id, IFormCollection collection) =>
         (
             from formData in ParseFormData(collection)
@@ -55,7 +58,7 @@ book with
             )
             select updatedBook
         )
-        .MapAsync<Book, IActionResult>(book => View(new BooksEditViewModel(book)))
+        .MapAsync(book => ViewComponentRenderer.RenderAsync("Book", new BooksEditViewModel(book)))
         .OrElse(StatusCode(500, "An unexpected error occurred on the server."));
 
     [HttpPost]