attempt to change out ActionController::LogSubscriber in rails 3

custom_log_subscriber.rb

#put this in config/initializers/custom_ac_log_subscriber.rb

## needed if we re-enable additions
#
#require 'active_support/core_ext/object/blank' 
module MyApp
  #TODO: we should no longer interit from ActionController::LogSubscriber
  #      as we are not truly unregistering the parent.
  class CustomAcLogSubscriber < ActiveSupport::LogSubscriber
    INTERNAL_PARAMS = ActionController::LogSubscriber::INTERNAL_PARAMS
    def start_processing(event)
      payload = event.payload
      params  = payload[:params].except(*INTERNAL_PARAMS)
      format_or = payload[:formats].first.to_s.upcase  || "-"
      info "Processing #{payload[:controller]}##{payload[:action]} to #{format_or} (for ? at ?) [#{payload[:method]}] X-PachubeRequestId: notpopulated"
      info "  Parameters: #{params.inspect}" unless params.empty?
    end

    def process_action(event)
      payload   = event.payload
      additions = ActionController::Base.log_process_action(payload)
      status_code = payload[:status] || "-"
      status_word = Rack::Utils::HTTP_STATUS_CODES[payload[:status]] || "-"
      message = "Completed in %.0fms (View: 0, DB: 0) | #{status_code} #{status_word} [#{payload[:path]}]" % event.duration
      #These "Additions" would be very nice to have, 
      # but our existing log format doesn't support them
      #
      #message << " (#{additions.join(" | ")})" unless additions.blank?
      info(message)
    end

    def logger
      ActionController::Base.logger
    end
  end
end

#Failed approach: 
#unregister the default LogSubscriber - our inherited one will do all.
#ActiveSupport::LogSubscriber.log_subscribers.delete_if{ |ls| 
#  ls.instance_of? ActionController::LogSubscriber }
 
#Working approach:
#Clear subscription from notifications for all of
# * process_action.action_controller
# * start_processing.action_controller
#Note that this undesireably unregisters everybody's interest in these,
#not just that of ActionController::LogSubscriber
#but we're unregistering everybody.
%w(process_action start_processing).each do |evt|
  ActiveSupport::Notifications.unsubscribe "#{evt}.action_controller"
end

#register our one
MyApp::CustomAcLogSubscriber.attach_to :action_controller