question model

gistfile1.rb

class Question < ActiveRecord::Base

  scope :start_questions, -> { where(start: true) }

  def end_question?
    self.next_question_id_for_yes.nil? && self.next_question_id_for_no.nil?
  end

  def start_question?
    self.start?
  end

  def next_question_for(answer)
    next_question_id = self.send("next_question_id_for_#{answer}".to_sym)
    Question.find(next_question_id)
  end

end