RandomSkunk.Results.AspNetCore 1.4.0

RandomSkunk.Results.AspNetCore

IActionResult extension methods

This library defines extension methods to convert each result type - Result, Result<T>, and Maybe<T> - directly into an equivalent IActionResult. For Fail results of any type, the error is converted to a ProblemDetails object (as described below) and used as the content of the returned action result; its HTTP status code comes from the error's error code. For Success results of type Result<T> and Maybe<T>, the value is used as the content of the returned action result which has a 200 OK status code. The HTTP status code to use for Success results can be customized by providing the optional parameter in the ToActionResult() extension method.

// Result
Result result1 = Result.Success();
result1.ToActionResult(); // 200

Result result2 = Result.Fail("Bad Request", errorCode: 400);
result2.ToActionResult(); // 400 { "status": 400, "title": "Error", "detail": "Bad Request" }

// Result<T>
Result<int[]> result3 = new[] { 1, 2, 3 }.ToResult();
result3.ToActionResult(); // 200 [ 1, 2, 3 ]

Result<int[]> result4 = Result<int[]>.Fail("Forbidden", errorCode: 403);
result4.ToActionResult(); // 403 { "status": 403, "title": "Error", "detail": "Forbidden" }

// Maybe<T>
Maybe<int[]> result5 = new[] { 4, 5, 6 }.ToMaybe();
result5.ToActionResult(); // 200 [ 4, 5, 6 ]

Maybe<int[]> result6 = Maybe<int[]>.None;
result6.ToActionResult(); // 404 { "status": 404, "title": "Error", "detail": "Not Found" }

Maybe<int[]> result7 = Maybe<int[]>.Fail("Not Acceptable", errorCode: 406);
result7.ToActionResult(); // 406 { "status": 406, "title": "Error", "detail": "Not Acceptable" }

GetProblemDetails extension method

The GetProblemDetails extension method creates a Microsoft.AspNetCore.Mvc.ProblemDetails object from a RandomSkunk.Results.Error object. This extension method is called from the IActionResult extension methods when for Fail results.

public IActionResult ExampleControllerMethod()
{
    Result result = ... // Do some work, returning a Result object

    return result.Match(
        onSuccess: () => Ok(),
        onFail: error =>
        {
            int errorCode = error.ErrorCode ?? 500;
            ProblemDetails problemDetails = error.GetProblemDetails();
            return StatusCode(errorCode, problemDetails);
        });
}