All basic CRUD operations are supported, and you can perform advanced finds with arbitrary parameters. A brief example of fetching a record, modifying it, and saving it:
var post = [Post find:@"42"]; [post setTitle:@"Why X is Better than Y"]; [post save];
Check out the README on the project's page on GitHub for more details and usage examples.
If you're a Rails developer waiting for a good opportunity to try out Cappuccino, there's no better time than now.
If you're a Cappuccino developer looking for an easy-to-use, powerful back-end for your applications, Rails might be the answer for you.
CR is a young project, but it drives one of my client applications that is production-ready (albeit not deployed), so I believe it is ready for prime time. Please try it and let me know how it goes.
Fork, report issues, et cetera.