def obfuscate_id_default_spin
      alphabet = Array("a".."z")
      number = name.split("").collect do |char|
        alphabet.index(char)
      end

      number.shift(12).join.to_i
    end
def obfuscate_id_default_spin
      alphabet = Array("a".."z")
      number = name.split("").collect do |char|
        alphabet.index(char)
      end

      number.shift(12).join.to_i
    end
Generate a default spin from the Model name
 This makes it easy to drop obfuscate_id onto any model
 and produce different obfuscated ids for different models