How to sync sqlite with a REST web-service in IOS

Is there a good tutorial on how to sync a sqlite to a REST web-service. I have been searching this in the internet and found none. I'm working on a simple app that collects user information and 'POST' it in the web-service and 'Get' to store on local sqlite db on iphone. If there's no internet connection it will automatically store on the local db and will update the web-service if there is an internet connection. Thanks!