FunWithStringNext

fun_with_string_next.rb

class FunWithStringNext < ActiveRecord::Base
  def create_identifier
    total = FunWithStringNext.count
    # ENUMERATOR: identifier_generator.take(total).last
    generate_identifier_by_count(total)
  end

  def identifier_generator
    Enumerator.new do |yielder|
      init = INITIAL_IDENTIFIER.dup
      loop do
        yielder << init.dup
        init.next!
      end
    end
  end

  def generate_identifier_by_count(count, current = INITIAL_IDENTIFIER)
    return current if count == 0
    generate_identifier_by_count(count - 1, current.next)
  end
end