Added support for handle database errors (#184)

* Added `EntityFramework.Exceptions` package

* Changed the type of the `ResponseBase.Errors` property to `IEnumerable<string>`

* Error has been handled when the unique restriction is violated

src/Constants/ResponseMessages.cs

@@ -11,6 +11,8 @@ public class ResponseMessages
 
     public const string UnexpectedErrorMessage                             = "Hubo un error inesperado, por favor intente de nuevo.";
     public const string UnexpectedErrorsMessage                            = "Se encontraron errores inesperados, por favor intente de nuevo.";
+    public const string UniqueConstraintViolatedMessage                    = "Se detectó una violación a una restricción única (UNIQUE INDEX). " +
+                                                                             "Por favor, no envíe una entrada duplicada.";
 
     public const string DirectLineTokenFailedMessage                       = "Direct Line token API call failed.";
     public const string InactiveUserAccountMessage                         = "Cuenta de usuario inactiva.";

src/DataAccess/AppDbContext.cs

@@ -12,6 +12,7 @@ protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
                 // See https://github.com/DentallApp/back-end/issues/25.
                 warnings.Ignore(CoreEventId.PossibleIncorrectRequiredNavigationWithQueryFilterInteractionWarning));
         optionsBuilder.AddDelegateDecompiler();
+        optionsBuilder.UseExceptionProcessor();
     }
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)

src/DentallApp.csproj

@@ -16,6 +16,7 @@
     <PackageReference Include="EFCore.CustomDbContext" Version="1.0.0" />
     <PackageReference Include="EFCore.CustomQueryPreprocessor" Version="2.0.0" />
     <PackageReference Include="EFCore.NamingConventions" Version="7.0.0" />
+    <PackageReference Include="EntityFrameworkCore.Exceptions.MySQL.Pomelo" Version="6.0.3" />
     <PackageReference Include="File.TypeChecker" Version="3.0.0" />
     <PackageReference Include="itext7.pdfhtml" Version="4.0.5" />
     <PackageReference Include="libphonenumber-csharp" Version="8.13.4" />

src/Extensions/MvcBuilderExtensions.cs

@@ -16,11 +16,11 @@ where state.Value.Errors.Count > 0
                                   ErrorMessages = state.Value.Errors.Select(modelError => modelError.ErrorMessage)
                               }).ToDictionary(x => x.Key, x => x.ErrorMessages);
 
-                var result = new Response
+                var result = new
                 {
                     Success = false,
                     Message = InvalidModelStateMessage,
-                    Errors = errors
+                    Errors  = errors
                 };
                 return new BadRequestObjectResult(result);
             };

src/GlobalUsings.cs

@@ -143,6 +143,8 @@
 global using SendGrid.Helpers.Mail;
 global using SendGrid.Extensions.DependencyInjection;
 
+global using EntityFramework.Exceptions.Common;
+global using EntityFramework.Exceptions.MySQL.Pomelo;
 global using DelegateDecompiler;
 global using FileTypeChecker;
 global using FileTypeChecker.Extensions;

src/Middlewares/ExceptionHandlingMiddleware.cs

@@ -34,6 +34,12 @@ public async Task InvokeAsync(HttpContext context)
                 Message = UnexpectedErrorMessage
             };
 
+            if (exception is UniqueConstraintException)
+            {
+                context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
+                response.Errors = new[] { UniqueConstraintViolatedMessage };
+            }
+
             await context.Response.WriteAsJsonAsync(response);
         }
     }

src/Responses/ResponseBase.cs

@@ -4,7 +4,7 @@ public class ResponseBase
 {
     public bool Success { get; set; }
     public string Message { get; set; }
-    public IDictionary<string, IEnumerable<string>> Errors { get; set; }
+    public IEnumerable<string> Errors { get; set; }
 
     public ResponseBase()
     {