FunctionalDDD.Asp 1.1.0-alpha.21

ASP Extension

This library will help convert Error objects to ASP.NET Core ActionResult.

• ToOkActionResult
• ToErrorActionResult

ToOkActionResult

Use this method to convert Result to OkObjectResult or various failed results.

ToErrorActionResult

Use this method to convert Error to various failed results. The mapping is as follows

    NotFoundError => (ActionResult<T>)controllerBase.NotFound(error),
    ValidationError validation => ValidationErrors<T>(validation, controllerBase),
    ConflictError => (ActionResult<T>)controllerBase.Conflict(error),
    UnauthorizedError => (ActionResult<T>)controllerBase.Unauthorized(error),
    ForbiddenError => (ActionResult<T>)controllerBase.Forbid(error.Message),
    UnexpectedError => (ActionResult<T>)controllerBase.StatusCode(500, error),
    _ => throw new NotImplementedException($"Unknown error {error.Code}"),

Example

Simple case.

[HttpPost("[action]")]
public ActionResult<User> Register([FromBody] RegisterRequest request) =>
    FirstName.New(request.firstName)
    .Combine(LastName.New(request.lastName))
    .Combine(EmailAddress.New(request.email))
    .Bind((firstName, lastName, email) => SampleWebApplication.User.New(firstName, lastName, email, request.password))
    .ToOkActionResult(this);

To control the return type

[HttpPost("[action]")]
public ActionResult<User> RegisterCreated2([FromBody] RegisterRequest request) =>
    FirstName.New(request.firstName)
    .Combine(LastName.New(request.lastName))
    .Combine(EmailAddress.New(request.email))
    .Bind((firstName, lastName, email) => SampleWebApplication.User.New(firstName, lastName, email, request.password))
    .Finally(
        ok => CreatedAtAction("Get", new { name = ok.FirstName }, ok),
        err => err.ToErrorActionResult<User>(this));

ToPartialOrOkActionResult

ToPartialOrOkActionResult can be used to support pagination. The function takes in three parameters to, from and length and based on the values will return PartialContent (206) or Okay(200) per RFC9110