Adding Web service API to Michael Hartl's completed Rails Tutorial [closed]

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Thank you Michael Hartl, the tutorial is awesome!

Can anyone please advise of the next steps to expose some functionality in the form of a service API. in particular, I am interested in having an iPhone client and was wondering of the best way (most secure, 开发者_开发问答fast, clean) to accomplish that. Is it advisable to introduce a token that would be passed with every service call? what I can add to the current authentication/session implementation to mirror this on the iPhone side? (i.e, carry a "forever" session, and secure API calls).

Thank you! any help is much appreciated!