Turn exceptions into actor failures

By default, errors on inputs will raise an exception, even when using .result instead of .call.

If instead you want to mark the actor as failed, you can catch the exception to treat it as an actor failure:

class PlaceOrder < Actor
  fail_on ServiceActor::ArgumentError

  input :currency, in: ["EUR", "USD"]

  # …
end

actor = PlaceOrder.result(currency: nil)
actor.success? # => false
actor.error # => 'Input currency must be included in ["EUR", "USD"] but instead was nil'

You can use fail_on on any exception you wish to turn into a failure.