but how should I do the catch block where it sees ...

# rx

[ursus]

but how should I do the catch block where it sees the messageId param?

[kioba]

messageRepository
.insertSendingTextMessage(...)
  .flatMap { messageId ->
    apiClient.postMessage(...)
      .flatMap{ apiMessage -> messageRepository.updateSentMessageAndParents(apiMessage) }
      .onErrorResumeNext { error -> 
        messageRepository.updateMessageState(messageId, MessageState.ERROR) }
        .flatMap{ Observable.error(error) }
      }// ONLY if you want to trigger the error but My suggestion would be to return a Succes() / Error() sealed class.
  }

[kioba]

the .flatMap{ Observable.error(error) } at the end is there only because when you catch an exception you also throw it again. but it is up to you if you want to keep it or not 🙂

[ursus]

Yea nesting, I thought about that. Thanks. Btw now, how would you add the if (messageId != null) messageRepository.updateMessageState(messageId, MessageState.ERROR) catch?

[ursus]

just throw from the insertSendingTextMessage, right?

[kioba]

right now if insertSendingTextMessage fails, it never executes the inner part so the onErrorResumeNext { updateMessageState() } never gets called.

[ursus]

yes, nesting for visiblity gave it to you automatically, nice, thanks

[kioba]

yes exactly as you said, any time 👍