test.rb

record_menses_times = app_user.app_menses_timelines.count
if record_menses_times > 1
  relation = app_user.app_menses_timelines.order(start_date: :desc)
  relation.each_with_index do |app_menses_timeline, menses_index|
    if app_menses_timeline.interval.to_i < 2
      app_user.update(is_valid: false)
      break
    end
    menses_interval = nil
    if (relation.length-menses_index) != 1
      menses_interval = ( app_menses_timeline.start_date - relation[menses_index+1].start_date ).to_i
      if (menses_interval <= 7) || (menses_interval >= 60)
        app_user.update(is_valid: false)
        break
      end
    end
  end
else
  app_user.update(is_valid: false)
end