Best practices to present error when there are viewable and not viewable flow

[alexvbush]

Original issue: uber/RIBs#160

Let's suppose we have:

SignIn (viewable) -> SignInProcessA (not viewable) -> SignInProcessB (not viewable)

Supposing that in SignInProcessB Interactor we had an error, I have some questions:

• It should call a method from it's listener i.e: self.listener?.hadErrorSigningIn(error) recursively until it arrives at SignIn (viewable) to use presentable like: self.presentable.present(error)?

• If above answer is right, should I call something like:

  self.router.detach(animated: true) {
  self.listener?.hadErrorSigningIn(error)
  }
  in order to grant that everything was detached when it arrives at SignIn(viewable) ?

Thanks in advance...