Add Map Extension Method to Support Mapping from Result<T> to Result (#213)

Author: jmrtnz94

src/Ardalis.Result/ResultExtensions.cs

@@ -334,5 +334,39 @@ private static Result HandleNonSuccessStatus<TSource>(Result<TSource> result)
                 _ => throw new NotSupportedException($"Result {result.Status} conversion is not supported."),
             };
         }
+        
+        /// <summary>
+        /// Transforms a Result's type from a source type to a non-generic Result type.
+        /// </summary>
+        /// <typeparam name="TSource"></typeparam>
+        /// <param name="result"></param>
+        /// <returns></returns>
+        /// <exception cref="NotSupportedException"></exception> 
+        public static Result Map<TSource>(this Result<TSource> result)
+        {
+            switch (result.Status)
+            {
+                case ResultStatus.Ok: return Result.Success();
+                case ResultStatus.NotFound: return result.Errors.Any()
+                    ? Result.NotFound(result.Errors.ToArray())
+                    : Result.NotFound();
+                case ResultStatus.Unauthorized: return result.Errors.Any()
+                    ? Result.Unauthorized(result.Errors.ToArray())
+                    : Result.Unauthorized();
+                case ResultStatus.Forbidden: return result.Errors.Any()
+                    ? Result.Forbidden(result.Errors.ToArray())
+                    : Result.Forbidden();
+                case ResultStatus.Invalid: return Result.Invalid(result.ValidationErrors);
+                case ResultStatus.Error: return Result.Error(new ErrorList(result.Errors.ToArray(), result.CorrelationId));
+                case ResultStatus.Conflict: return result.Errors.Any()
+                    ? Result.Conflict(result.Errors.ToArray())
+                    : Result.Conflict();
+                case ResultStatus.CriticalError: return Result.CriticalError(result.Errors.ToArray());
+                case ResultStatus.Unavailable: return Result.Unavailable(result.Errors.ToArray());
+                case ResultStatus.NoContent: return Result.NoContent();
+                default:
+                    throw new NotSupportedException($"Result {result.Status} conversion is not supported.");
+            }
+        }
     }
 }

tests/Ardalis.Result.UnitTests/ResultGenericToVoidMap.cs

@@ -0,0 +1,125 @@
+using FluentAssertions;
+using FluentAssertions.Execution;
+using System;
+using System.Linq;
+using Xunit;
+
+namespace Ardalis.Result.UnitTests;
+
+public class ResultGenericToVoidMap
+{
+    [Fact]
+    public void ShouldProduceSuccess()
+    {
+        var result = Result<int>.Success(1);
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Ok);
+    }
+
+    [Fact]
+    public void ShouldProduceNotFound()
+    {
+        var result = Result<int>.NotFound();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.NotFound);
+    }
+
+    [Fact]
+    public void ShouldProduceUnauthorized()
+    {
+        var result = Result<int>.Unauthorized();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Unauthorized);
+    }
+
+    [Fact]
+    public void ShouldProduceForbidden()
+    {
+        var result = Result<int>.Forbidden();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Forbidden);
+    }
+
+    [Fact]
+    public void ShouldProduceInvalid()
+    {
+        var result = Result<int>.Invalid(new ValidationError());
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Invalid);
+    }
+
+    [Fact]
+    public void ShouldProduceError()
+    {
+        var result = Result<int>.Error();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Error);
+    }
+
+    [Fact]
+    public void ShouldProduceErrorWhenConstructedWithErrorList()
+    {
+        string correlationId = Guid.NewGuid().ToString();
+        string errorMessage = "Error occured 💥";
+        var result = Result<int>.Error(new ErrorList([errorMessage], correlationId));
+
+        var actual = result.Map();
+
+        using var assertionScope = new AssertionScope();
+        actual.Status.Should().Be(ResultStatus.Error);
+        actual.CorrelationId.Should().Be(correlationId);
+        actual.Errors.Single().Should().Be(errorMessage);
+    }
+
+    [Fact]
+    public void ShouldProduceConflict()
+    {
+        var result = Result<int>.Conflict();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Conflict);
+    }
+
+    [Fact]
+    public void ShouldProduceCriticalError()
+    {
+        var result = Result<int>.CriticalError();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.CriticalError);
+    }
+
+    [Fact]
+    public void ShouldProduceUnavailable()
+    {
+        var result = Result<int>.Unavailable();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.Unavailable);
+    }
+
+    [Fact]
+    public void ShouldProduceNoContent()
+    {
+        var result = Result<int>.NoContent();
+
+        var actual = result.Map();
+
+        actual.Status.Should().Be(ResultStatus.NoContent);
+    }
+}