as per Initialize max value in Ruby on Rails ActiveRecord, automagically

Initialize max value the Server Way in a Fat Model, the server way, revised with lots of AutoMagic

def after_initialize
  if self.new_record? then 
     key = self.class.to_s
     max_initialize_value_field = 'display_order'
     $max_initialize_value = Hash.new() if !(defined? $max_initialize_value)
     $max_initialize__value_dateTime = Hash.new() if !(defined? $max_initialize__value_dateTime)
     if ( $max_initialize_value[key].nil? ) || ( ( !$max_initialize__value_dateTime[key].nil? )&& 
              ( ( (Time.now - $max_initialize__value_dateTime[key]).to_i ) > ( 10 *60 ) )) then       
          max_initialize_value = self.class.maximum(max_initialize_value_field)
          max_initialize_value = 0 if max_initialize_value.nil? 
     else
         max_initialize_value = $max_initialize_value[key]
     end
     max_initialize_value = max_initialize_value + 1
     $max_initialize_value[key] = max_initialize_value 
     $max_initialize__value_dateTime[key] = Time.now
     self.sequence_order = max_initialize_value 
  end       
end

as per http://www.falsepositives.com/index.php/2010/08/23/initialize-max-value-in-ruby-on-rails-activerecord-automagically/ Initialize max value in Ruby on Rails ActiveRecord, automagically