accepts_nested_attributes

_option_fields.html.haml

%fieldset.answer
  = f.label :title
  = f.text_field :title
  = f.label :body
  = f.text_field :body
  = f.check_box :_destroy
  = f.label :_destroy
  %br

_form.html.haml

= form_for(@question) do |f|
  - if @question.errors.any?
    #error_explanation
      %h2
        = pluralize(@question.errors.count, "error")
        prohibited this question from being saved:
      %ul
        - @question.errors.full_messages.each do |msg|
          %li= msg
  .field
    = f.label :title
    %br
    = f.text_field :title
  .field
    = f.label :body
    %br
    = f.text_area :body
  %h3 Options
  = f.fields_for :options do |opt|
    = render "option_fields", f: opt
    
  = link_to_add_fields "Add Option", f, :options
  %br

  = f.submit