From: Cris Shupp <cshupp1@...>
Date: 2009-08-13T06:50:49+09:00
Subject: skip_before_filter (Do I need a lesson in modules/mixins?)

Gurus,

I am reading the O'Reilly book "Rails: Up and Running, 2nd Edition" and
the author told me to add the following line of code:

skip_before_filter :verify_authenticity_token

as follows:

class SlidesController < ApplicationController
  skip_before_filter :verify_authenticity_token
  ...

This stopped me dead in my tracks as I realized I had no idea what was
going on.  I am using Aptana (Eclipse) and so it can tell me that
skip_before_filter is defined in the module ClassMethods.  I am assuming
that somehow this method (skip_before_filter) is mixed in?

The implementation is:
      def skip_before_filter(*filters)
        filter_chain.skip_filter_in_chain(*filters, &:before?)
      end

What is *filters?  Did I miss this in my 'Learning Ruby' book?

Anyway, I guessed that I was calling the method 'skip_before_filter'
sometime during my controller's construction.  So I built a toy to
validate as follows:
####################BEGIN
test.rb###############################################
module Test
  def call_me
    puts "Mixin called"
  end
end
module Test2
  def call_me
    puts "second mixin called"
  end
end

class Tester
  include Test, Test2
  #call_me() #this call fails.  This blows my theory...

  def initialize
    super
    call_me()# this call works, but how would I call the other one?
    #Test2::call_me()#this call fails
    puts "A tester was built"
  end

end

Tester.new
########################################END test.rb###########

output is:
Mixin called
A tester was built


Thanks for your help with my questions.

Cris
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