Deffon fucked around with this message at 21:46 on Feb 13, 2021

Foxfire_ fucked around with this message at 00:19 on Feb 14, 2021

// definition
public abstract class FooResult
{
    public static readonly FooNotFoundResult NotFound { get; } = new FooNotFoundResult();
    public static readonly FooAccessDeniedResult AccessDenied { get; } = new FooAccessDeniedResult();

    public static SuccessfulFooResult Success(Foo foo) => new SuccessfulFooResult(foo);
}

public class FooNotFoundResult : FooResult
{
}

public class FooAccessDeniedResult : FooResult
{
}

public class SuccessfulFooResult : FooResult
{
    public SuccessfulFooResult(Foo foo) => Foo = foo;

    public Foo Foo { get; }
}

// usage
public class Producer // e.g. a repository
{
    public FooResult GetFoo(int id)
    {
        var foo = GetFooById(id);
        if (foo == null) return FooResult.NotFound;
        else if (!HasAccess(foo)) return FooResult.AccessDenied;
        else return FooResult.Success(foo);
    }
}

public class Consumer // e.g. an API controller
{
    public IActionResult HandleFoo(int id)
    {
        return _producer.GetFoo(id) switch
        {
            FooNotFoundResult _ => NotFound(),
            FooAccessDeniedResult _ => Forbid(),
            SuccessfulFooResult foo => Ok(foo.Foo),
            _ => throw new InvalidOperationException("Unexpected foo result"),
        };
    }
}

LOOK I AM A TURTLE fucked around with this message at 11:10 on Feb 20, 2021

dwazegek fucked around with this message at 11:54 on Feb 21, 2021

Hammerite fucked around with this message at 14:42 on Feb 21, 2021