fluent validation added to product

Author: babisque

Catalog/Catalog.API/Controllers/ProductController.cs

@@ -2,6 +2,8 @@
 using Catalog.Core.Entities;
 using Catalog.Core.Logging;
 using Catalog.Core.Repositories;
+using FluentValidation;
+using FluentValidation.Results;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Catalog.API.Controllers
@@ -12,11 +14,13 @@ public class ProductController : ControllerBase
     {
         private readonly IProductRepository _productRepository;
         private readonly ILogger<ProductController> _logger;
+        private readonly IValidator<Product> _validator;
 
-        public ProductController(IProductRepository productRepository, ILogger<ProductController> logger)
+        public ProductController(IProductRepository productRepository, ILogger<ProductController> logger, IValidator<Product> validator)
         {
             _productRepository = productRepository;
             _logger = logger;
+            _validator = validator;
         }
 
         [HttpPost]
@@ -35,6 +39,20 @@ public async Task<ActionResult<Product>> Post([FromForm] ProductDtoRequest req)
                     Image = req.Image != null ? await GetImageBytesAsync(req.Image) : null,
                     Stock = req.Stock
                 };
+                
+                ValidationResult result = await _validator.ValidateAsync(product);
+                if (!result.IsValid)
+                {
+                    
+                    var errors = result.Errors
+                        .GroupBy(e => e.PropertyName)
+                        .ToDictionary(
+                            g => g.Key,
+                            g => g.Select(e => e.ErrorMessage).ToArray()
+                        );
+                    
+                    return BadRequest(new ValidationProblemDetails(errors));
+                }
 
                 await _productRepository.CreateAsync(product);
                 _logger.LogInformation($"Product created successfully with ID {product.Id}.");

Catalog/Catalog.API/Program.cs

@@ -1,6 +1,9 @@
+using Catalog.Core.Entities;
 using Catalog.Core.Logging;
 using Catalog.Core.Repositories;
+using Catalog.Core.Validators;
 using Catalog.Infrastructure.Repositories;
+using FluentValidation;
 using Microsoft.EntityFrameworkCore;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -27,6 +30,7 @@
 });
 
 builder.Services.AddScoped<IProductRepository, ProductRepository>();
+builder.Services.AddScoped<IValidator<Product>, ProductValidator>();
 
 var app = builder.Build();
 

Catalog/Catalog.Core/Catalog.Core.csproj

@@ -7,6 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="FluentValidation" Version="11.9.1" />
         <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.2.0" />
         <PackageReference Include="Microsoft.AspNetCore.Http.Features" Version="2.2.0" />
         <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />

Catalog/Catalog.Core/Validators/ProductValidator.cs

@@ -0,0 +1,16 @@
+using Catalog.Core.Entities;
+using FluentValidation;
+
+namespace Catalog.Core.Validators;
+
+public class ProductValidator : AbstractValidator<Product>
+{
+    public ProductValidator()
+    {
+        RuleFor(p => p.Name).NotEmpty().Length(0, 100);
+        RuleFor(p => p.Description).MaximumLength(255);
+        RuleFor(p => p.Price).GreaterThan(0);
+        RuleFor(p => p.Category).NotEmpty();
+        RuleFor(p => p.Stock).GreaterThanOrEqualTo(0);
+    }
+}