response_to с format.js не работает для новых действий

Я использую Rails 4, и я использую MongoDB с монгольским камнем. У меня есть модель, которая embeds_many todo_items. Когда я хочу создать новую и показать форму с помощью jquery, я определил такие вещи как таковые:

конфиг /routes.rb

...
  resources :data do
    resources :todo_items#, shallow: true
  end
...

приложение/модели /datum.rb:

class Datum
  include Mongoid::Document
  include Mongoid::Timestamps

  field :title, type: String
  field :user_id, type: Integer

  validates :title, presence: true
  validates :user_id, presence: true

  embeds_many :todo_items
end

приложение/модели /todo_item.rb

class TodoItem
  include Mongoid::Document
  include Mongoid::Timestamps

  field :task, type: String
  field :content, type: String

  validates :task, presence: true

  embedded_in :datum, inverse_of: :todo_items
end

приложение/контроллеры/todo_items_controller.rb

class TodoItemsController < ApplicationController
  def new
    @todo = TodoItem.new
    respond_to do |format|
      format.js
    end
  end

  def create
    @datum = Datum.find(params[:datum_id])
    @todo = @datum.todo_items.create!(params[:todo])
    respond_to do |format|
      format.js
    end
  end
end

внутри приложения /views/data/edit.html.erb:

<%= link_to 'Add ToDo', new_datum_todo_item_path(@datum.id), remote: true %>

приложение/просмотров/данные /todo_items/new.js.erb:

$('.panel-body').append("<%= escape_javascript(render partial: 'form', @todo) %>")

Когда я нажимаю на эту ссылку, я получаю странную ошибку на respond_to линии в моем todo_items_controller для new действия (строка 4):

(Я замечаю, что тип этого запроса отображается как text/plain, что кажется неправильным)

SyntaxError at /data/532799016a616b1786040000/todo_items/new
============================================================

> syntax error, unexpected ')', expecting =>

app/controllers/todo_items_controller.rb, line 4
------------------------------------------------

''' ruby
    1   class TodoItemsController < ApplicationController
    2     def new
    3       @todo = TodoItem.new
>   4       respond_to do |format|
    5         format.js
    6       end
    7     end
    8   
    9     def create
'''

App backtrace
-------------

 - app/controllers/todo_items_controller.rb:4:in 'new'

Full backtrace
--------------

 - actionpack (4.0.2) lib/action_view/template.rb:299:in ''
 - actionpack (4.0.2) lib/action_view/template.rb:299:in 'compile'
 - actionpack (4.0.2) lib/action_view/template.rb:248:in 'block in compile!'
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 - actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in 'block in instrument'
 - activesupport (4.0.2) lib/active_support/notifications.rb:159:in 'block in instrument'
 - activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in 'instrument'
 - activesupport (4.0.2) lib/active_support/notifications.rb:159:in 'instrument'
 - actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in 'instrument'
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 - actionpack (4.0.2) lib/action_view/renderer/renderer.rb:42:in 'render_template'
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 - actionpack (4.0.2) lib/abstract_controller/rendering.rb:127:in '_render_template'
 - actionpack (4.0.2) lib/action_controller/metal/streaming.rb:219:in '_render_template'
 - actionpack (4.0.2) lib/abstract_controller/rendering.rb:120:in 'render_to_body'
 - actionpack (4.0.2) lib/action_controller/metal/rendering.rb:33:in 'render_to_body'
 - actionpack (4.0.2) lib/action_controller/metal/renderers.rb:26:in 'render_to_body'
 - actionpack (4.0.2) lib/abstract_controller/rendering.rb:97:in 'render'
 - actionpack (4.0.2) lib/action_controller/metal/rendering.rb:16:in 'render'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in 'block (2 levels) in render'
 - activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in 'block in ms'
 - /home/jake/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in 'realtime'
 - activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in 'ms'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in 'block in render'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:84:in 'cleanup_view_runtime'
 - activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:25:in 'cleanup_view_runtime'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:40:in 'render'
 - actionpack (4.0.2) lib/action_controller/metal/mime_responds.rb:191:in 'respond_to'
 - app/controllers/todo_items_controller.rb:4:in 'new'
 - actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:4:in 'send_action'
 - actionpack (4.0.2) lib/abstract_controller/base.rb:189:in 'process_action'
 - actionpack (4.0.2) lib/action_controller/metal/rendering.rb:10:in 'process_action'
 - actionpack (4.0.2) lib/abstract_controller/callbacks.rb:18:in 'block in process_action'
 - activesupport (4.0.2) lib/active_support/callbacks.rb:403:in '_run__3035648896614723876__process_action__callbacks'
 - activesupport (4.0.2) lib/active_support/callbacks.rb:80:in 'run_callbacks'
 - actionpack (4.0.2) lib/abstract_controller/callbacks.rb:17:in 'process_action'
 - actionpack (4.0.2) lib/action_controller/metal/rescue.rb:29:in 'process_action'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:31:in 'block in process_action'
 - activesupport (4.0.2) lib/active_support/notifications.rb:159:in 'block in instrument'
 - activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in 'instrument'
 - activesupport (4.0.2) lib/active_support/notifications.rb:159:in 'instrument'
 - actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:30:in 'process_action'
 - actionpack (4.0.2) lib/action_controller/metal/params_wrapper.rb:245:in 'process_action'
 - activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:18:in 'process_action'
 - actionpack (4.0.2) lib/abstract_controller/base.rb:136:in 'process'
 - actionpack (4.0.2) lib/abstract_controller/rendering.rb:44:in 'process'
 - actionpack (4.0.2) lib/action_controller/metal.rb:195:in 'dispatch'
 - actionpack (4.0.2) lib/action_controller/metal/rack_delegation.rb:13:in 'dispatch'
 - actionpack (4.0.2) lib/action_controller/metal.rb:231:in 'block in action'
 - actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in 'dispatch'
 - actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:48:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/journey/router.rb:71:in 'block in call'
 - actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:680:in 'call'
 - rack (1.5.2) lib/rack/etag.rb:23:in 'call'
 - rack (1.5.2) lib/rack/conditionalget.rb:25:in 'call'
 - rack (1.5.2) lib/rack/head.rb:11:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/params_parser.rb:27:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/flash.rb:241:in 'call'
 - rack (1.5.2) lib/rack/session/abstract/id.rb:225:in 'context'
 - rack (1.5.2) lib/rack/session/abstract/id.rb:220:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/cookies.rb:486:in 'call'
 - activerecord (4.0.2) lib/active_record/query_cache.rb:36:in 'call'
 - activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in 'call'
 - activerecord (4.0.2) lib/active_record/migration.rb:369:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in 'block in call'
 - activesupport (4.0.2) lib/active_support/callbacks.rb:373:in '_run__4018668017969335281__call__callbacks'
 - activesupport (4.0.2) lib/active_support/callbacks.rb:80:in 'run_callbacks'
 - actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in 'call'
 - better_errors (1.0.1) lib/better_errors/middleware.rb:84:in 'protected_app_call'
 - better_errors (1.0.1) lib/better_errors/middleware.rb:79:in 'better_errors_call'
 - better_errors (1.0.1) lib/better_errors/middleware.rb:56:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in 'call'
 - railties (4.0.2) lib/rails/rack/logger.rb:38:in 'call_app'
 - railties (4.0.2) lib/rails/rack/logger.rb:20:in 'block in call'
 - activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in 'block in tagged'
 - activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in 'tagged'
 - activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in 'tagged'
 - railties (4.0.2) lib/rails/rack/logger.rb:20:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in 'call'
 - rack (1.5.2) lib/rack/methodoverride.rb:21:in 'call'
 - rack (1.5.2) lib/rack/runtime.rb:17:in 'call'
 - activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in 'call'
 - rack (1.5.2) lib/rack/lock.rb:17:in 'call'
 - actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in 'call'
 - rack (1.5.2) lib/rack/sendfile.rb:112:in 'call'
 - railties (4.0.2) lib/rails/engine.rb:511:in 'call'
 - railties (4.0.2) lib/rails/application.rb:97:in 'call'
 - rack (1.5.2) lib/rack/lock.rb:17:in 'call'
 - rack (1.5.2) lib/rack/content_length.rb:14:in 'call'
 - rack (1.5.2) lib/rack/handler/webrick.rb:60:in 'service'
 - /home/jake/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in 'service'
 - /home/jake/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in 'run'
 - /home/jake/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in 'block in start_thread'

Могу ли я получить помощь? Я был бы очень признателен :)

ОБНОВИТЬ:

Ответ ниже определенно сделал трюк. Было всего несколько небольших изменений, которые должны были произойти, чтобы заставить его работать до конца! Во-первых, для new действия todo_items_controller эта строка добавлена: @datum = Datum.find(params[:datum_id]). Затем добавьте другую локальную переменную в вызов render части _form.html.erb. Затем, в частичном, мне пришлось заменить вход todo на form_for с массивом, который включает в себя form_for datum и новое todo: bootstrap_form_for([datum, todo])...