Combine multiple ValidationResults

[leandromoh]

Is your feature request related to a problem? Please describe.

No, just a useful method that I could not find in the lib.
Is there any "native" way to combine/join multiples ValidationResult's?

Describe the solution you'd like

It is very useful to combine/join mutiples ValidationResults into a new ValidationResults, for example..

  ValidationResult fullValidation = new[]
  {
      ValidationA(obj),
      ValidationB(obj),
      ValidationC(obj),
  }
  .Combine();

ValidationResult ValidationA(Person x) { ... }
ValidationResult ValidationB(Person x) { ... }
ValidationResult ValidationC(Person x) { ... }

Describe alternatives you've considered

In my current system I've added the following extension methods.
If there are interest to make them part of the library (in case of no current native solution) I can submit a PR.

public static ValidationResult Combine(this ValidationResult validationResult, params ValidationResult[] failuresResult)
{
    return failuresResult.Append(validationResult).Combine();
}

public static ValidationResult Combine(this IEnumerable<ValidationResult> failuresResult)
{
    var errors = failuresResult.SelectMany(x => x.Errors);

    return new ValidationResult(errors);
}

Additional Context

No response

[JeremySkinner]

I'm not keen on a Combine method, but I could add another constructor to ValidationResult that takes an IEnumerable<ValidationResult> if that'd be helpful?

[leandromoh]

I'm not keen on a Combine method, but I could add another constructor to ValidationResult that takes an IEnumerable<ValidationResult> if that'd be helpful?

Sure @JeremySkinner ! It would help a lot.
Any interest in add these extension methods in the lib ? I think it is worth.

[JeremySkinner]

Added the new constructor in 1f9102d. This will go in the 11.7 release.

I'm not keen on including the extension methods in the library, I don't feel they're necessary, but you can continue to use them within your own project.

[leandromoh]

@JeremySkinner thanks for the improvement (:

[JeremySkinner]

11.7.0 is now released with this change

[cremor]

Added the new constructor in 1f9102d. This will go in the 11.7 release.

@JeremySkinner What about the RuleSetsExecuted property? Do you not have to combine those too?

[JeremySkinner]

@cremor Yes you’re right, I missed that. I’ll try and push out a further update to resolve that when I get some time, or if you’d like to submit a PR that’d be very welcome

[cremor]

I'm not really sure what the correct implementation would be. Maybe this?

RuleSetsExecuted = otherResults.Where(x => x.RuleSetsExecuted != null).SelectMany(x => x.RuleSetsExecuted).Distinct().ToArray();

[JeremySkinner]

Yep I think that should work