answers_controller.rb

  def edit
    # Find or create all the answers needed for the selected options
    used_option_answers = []
    @participate.options.each do |option|
      option.option_questions.each do |option_question|
        unless @participate.option_answers.where(option_question_id: option_question.id).first
          # If the answer doesn't exist then create it
          option_answer = OptionAnswer.new(option_question_id: option_question.id, subscription_id: @participate.id)
          # we need to bypass the answer validation
          option_answer.save(validate: false)
          @participate.option_answers << option_answer
          used_option_answers << option_answer
        end
      end
    end