Fog Model Observer

fog_model.rb

require 'fog/hp/models/compute/address' 
require 'fog/hp/models/compute/flavor'
require 'fog/hp/models/compute/image'
require 'fog/hp/models/compute/key_pair'
require 'fog/hp/models/compute/security_group'
require 'fog/hp/models/compute/server'
  
# Re-open Fog::Model
module Fog
  class Model
    
    include ActiveModel::Observing  
        
    # Alias initialize so that we can override, but still invoke the original implementation
    alias_method :old_init, :initialize
        
    def initialize(new_attributes = {}) 
      # Kinda like calling 'super' (if we could)
      old_init(new_attributes)

      # Notify observers that something is being initialized
      notify_observers(:init)  
    end 
        
  end 
end   
      
      
class ModelObserver < ActiveModel::Observer
      
  # Note that it won't work if you observe Fog::Model, you need to
  # observe each of the specific classes you're interested in.
  observe Fog::Compute::HP::Address,
    Fog::Compute::HP::Flavor,  
    Fog::Compute::HP::Image,   
    Fog::Compute::HP::KeyPair, 
    Fog::Compute::HP::SecurityGroup,
    Fog::Compute::HP::Server   
      
  # Callback for :init event
  def init(x)
    puts 'callback'
    puts x.inspect
  end 
end   
      
# This thing is a singleton, need to ensure it is initialized                  
ModelObserver.instance 

Turns out you CANT user super when monkeypatching

http://stackoverflow.com/questions/4470108/when-monkey-patching-a-method-can-you-call-the-overridden-method-from-the-new-i

Hower alias_method DOES work.

See http://api.rubyonrails.org/classes/ActiveModel/Observing/ClassMethods.html#method-i-observers-3D

My guess is we can skip line 48 by tying in some sort of initialization step where observers are declared and instantiated...something similar to config.active_record.observers line when using ActiveRecord