K.M. wrote in post #1040052:
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/
+1

I also agree with the deprecation, and ultimate removal, of the
observe_field helpers. The same behavior can be duplicated with jQuery.
Rails should not include helpers that are tightly bound to any specific
JavaScript library.

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