craps.rb

class FunnelStrategy < ActiveRecord::Base

  belongs_to :organization

  STATES = State.new [
    :company_information,
    :strategy_information,
    :account_information,
    :landing_page,
    :email_1,
    :email_2,
    :email_3,
    :email_4,
    :complete
  ]

  def current_state
    state
  end

  def transition_to_next
    transition_to = next_state
    return false unless transition_to
    update(state: transition_to)
  end

  private

  def next_state
    STATES[state].next.try(:name)
  end

end


class State

  attr_accessor :next, :name

  def initialize(name, next_states = [])
    @name = name
    if next_states.first
      @next = State.new(next_states.first, next_states[1..-1])
    end
  end

  def [] index
    return self if name == index
    return @next && @next[index]
  end

end