How to get the current_user in a model observer? Solution!

gistfile1.rb

# install devise
# rails generate devise user
# rails g scaffold task name:string description:text

class ApplicationController < ActionController::Base
  before_filter :authenticate_user!
  around_filter :set_current_user_for_thread
  
  protect_from_forgery

  protected
    def set_current_user_for_thread
      Thread.current[:current_user] = current_user
      begin
        yield
      ensure
        Thread.current[:current_user] = nil
      end
    end    
end

class BaseObserver < ActiveRecord::Observer
  def current_user
    Thread.current[:current_user]
  end
end

class TaskObserver < BaseObserver
  def after_create(task)
    puts "#{current_user.email} created #{task.name}"
  end
end