[Rails] Rails multistep form with ajax

I am following Railscasts #217 and I have been able to make everything work using html protocol the only issue is that I need it to use ajax protocol instead. My question and code is very similar to stackoverflow question Multistep forms in Rails using AJAX . I understand how to setup ajax and make the form sumit remotely my question though is how do I pass over the forms variable i.e. "f" as in "<%= form_for @post do |f|>" Any help is appreciated.

Originally asked at http://stackoverflow.com/questions/18001406/rails-multistep-form-with-ajax-modification

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