class ActiveAdmin::Reloader::RailsLessThan31Reloader

development and once in production in Rails < 3.2.
Deals with reloading Active Admin on each request in

def attach!

Attach to Rails and perform the reload on each request. 
def attach!
  # Bring the checker into local scope for the ruby block
  checker = file_update_checker
  reloader_class.to_prepare do
    checker.execute_if_updated
  end
end

def initialize(rails_app, active_admin_app, rails_version) 

def initialize(rails_app, active_admin_app, rails_version)
  super
  @file_update_checker = FileUpdateChecker.new(watched_paths) do
    reload!
  end
end

def reload! 

def reload!
  super
  file_update_checker.paths.clear
  watched_paths.each{|path| file_update_checker.paths << path }
end

def reloader_class 

def reloader_class
  if major_rails_version == "3.1"
    ActionDispatch::Reloader
  else
    ActionDispatch::Callbacks
  end
end

def watched_paths 

def watched_paths
  paths = active_admin_app.load_paths
  active_admin_app.load_paths.each{|path| paths += Dir[File.join(path, "**", "*.rb")]}
  paths
end