[Rails] How to "intercept" each action call?

Hi! 

I'm a RoR beginner and I'm trying to make a gem that can "intercepts" all action from my controllers.

I would like to do something like that:

class ApplicationController < ActionController::Base

  include MyGem

end

class MyController < ApplicationController

  do_something_to :some_attribute

  def index

    respond_with(@some_attribute)

  end

end

In each call of index or other action from MyController, I want that MyGem execute "do_something_to" modifying the value of "some_attribute". Is it possible?

Thanks,

Lauro Caetano

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