How to sync CoreData and a REST web service asynchronously and the same time properly propagate any REST errors into the UI

Question

Hey, I\'m working on the model layer for our app here.

Some of the requirements are like this:

1. It should work on iPhone OS 3.0+.
2. The source of

Answer 1

You should really take a look at RestKit (http://restkit.org) for this use case. It is designed to solve the problems of modeling and syncing remote JSON resources to a local Core Data backed cache. It supports an offline mode for working entirely from the cache when there is no network available. All syncing occurs on a background thread (network access, payload parsing, and managed object context merging) and there is a rich set of delegate methods so you can tell what is going on.