Alterar todos os IDs dos elementos de uma DIV

_fields.slim

.form-group.form-inline.fields#teste
  .form-group
    = f.input :nexts, label: false, collection: [ "Enviar para","Pergunta","Objetivo","Post","Tarefa","Tag" ], include_blank: false, prompt: "Selecione a Opção", :input_html => { :id => "first_select", :name => 'page[nexts][]' }
  .form-group
    = f.input :nexts, label: false, collection: Question.order(:title), include_blank: false, prompt: "Selecione a pergunta", :input_html => { :id => "question_select", :name => 'page[nexts][]' }
  .form-group
    = f.input :nexts, label: false, collection: Question.order(:title), as: :grouped_select, group_method: :answer_options, label_method: :content, value_method: :id, include_blank: false, prompt: "Selecione a Reposta", :input_html => { :id => "answer_option_select", :name => 'page[nexts][]' }
  .form-group
    = f.input :nexts, label: false, collection: Page.order(:title), include_blank: false, prompt: "Selecione a página", :input_html => { :id => "next_select", :name => 'page[nexts][]' }

_form.html.slim

.form-group.form-inline
   = link_to_add_fields '<span class="glyphicon glyphicon-plus"></span> Adicionar nova opção'.html_safe, f

pages.js.coffee

# Script que renderiza os campos configurados
$(document).on 'click', 'form .add_fields', (event) ->

  data = $(this).data('fields')
  data2 = $(data).find('[id]').add(data).each ->
    @id = @id + '_1'

  $('.separator').before($(data2))
  event.preventDefault()

pages_helper.rb

# Método que monta a DIV com os campos
module PagesHelper
  def link_to_add_fields(name, f)
    id = f.object_id
    fields = render "fields", f: f
    link_to(name, '#', class: "add_fields btn btn-primary", data: {id: id, fields: fields.gsub("\n", "")})
  end
end