observe_field was deprecated as rails 3 is towards being javascript
agnostic and requires the developer to have a good grasp of
javascript.
http://www.simonecarletti.com/blog/2010/06/unobtrusive-javascript-in-rails-3/

On Jan 9, 9:49 pm, venkata reddy wrote:
looking here solved my problem.

http://gregmoreno.ca/rails-3-upgrade-part-4-prototype-helpers-and-jav...

I think observe_field is a good method to be included. Can't
understand why it's not there.
Thank you all!
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