hidden_​​field中的增量值如何？

Question

当我创建一个Poll的新答案时，我需要通过hidden_​​field：sequence之一来增加该值。我需要在hidden_​​field中添加什么值？

.poll_row
  .poll_item
    = f.input :answer, input_html: { class: 'ctrlenter expanding' }, label: false, placeholder: 'Введите вариант ответа'
    = f.hidden_field, :sequence, value:??????   
    = button_tag 'вверх', type: 'button', class: 'up_id', value: 'up'
    = button_tag 'вниз', type: 'button', class: 'down_id', value: 'down'
    - if @poll.editable?(current_user)
      = link_to_remove_association "remove", f, { wrapper_class: 'poll_item' }