Internal redirect_to for Rails 2.x

internal_redirect_to.rb

# This is an internal_redirect_to function by Sandro Paganotti
# http://www.railsonwave.com/2008/10/25/how-to-call-a-controller-s-action-from-a-different-controller

# By using this internal_redirect_to function you will be able to 
# get the same results as a normal redirect_to without send anything 
# to the user, only keep in mind to explicit invoke the return after 
# this function.

class ApplicationController
  def internal_redirect_to (options={})
    params.merge!(options)
    (c = ActionController.const_get(Inflector.classify("#{params[:controller]}_controller")).new).process(request,response)
    c.instance_variables.each{|v| self.instance_variable_set(v,c.instance_variable_get(v))} 
  end
end

# Then you can simply invoke this function by typing:

MasterController < ApplicationController
  def index
    internal_redirect_to :controller=>'another', :action=>'an_action'
    return 
  end
end