We have RoR application and we are planning to make js interface(extjs or closure) in new version.
Is it possible to use GWT with RoR?
We have RoR application and we are planning to make js interface(extjs or closure)
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As this is still the accepted answer, decided to update with more modern approaches
RESTful API
The tooling for creating and consuming API’s has improved markedly.
Creating REST JSON API from RoR is simple. Basically set controller to respond to a JSON request and serialise model to JSON
Consuming REST API from GWT has a good Stack Overflow answer how-to-call-restful-services-from-gwt
RoR to GWT RPC project (very dated)
The http://code.google.com/p/gwt-rails/ project is intended to provide easy to use RPC between RoR backend, and GWT UI.