Rails - Sep 2013 - ActiveRecord::UnknownAttributeError

I''m trying to create hotel with some fields, one of the fields is
photo, i
want to use multiple files upload with carrierwave and nested_form. I found 
this
article<http://lucapette.com/rails/multiple-files-upload-with-carrierwave-and-nested_form/>
and
have some result.

When i''m on /hotels/new
<http://img404.imageshack.us/img404/3474/8ta1.png>,
filling fields, choosing photos and press submit,
getting*ActiveRecord::UnknownAttributeError
in HotelsController#create unknown attribute: attachable_type.* *Console*

Started POST "/hotels" for 127.0.0.1 at 2013-09-27 17:35:18
+0300Processing by HotelsController#create as HTML
  Parameters: {"utf8"=>"✓",
"authenticity_token"=>"+1T2tuygSnj8unOKkXkRWI4L7KvDE
9PPHrqvag7KmIQ=",
"hotel"=>{"title"=>"dsa",
"address"=>"asd",
"star_rating"=>"2", "breakfast"=>"Not
include", "price_for_room"=>"sadas",
"room_description"=>"Gr
eat room",
"attachments_attributes"=>{"1380289954031"=>{"file"=>#<ActionDispatch::Http::UploadedFile:0xa5d546c
@original_filename="11374.jpg", @content_type="im
age/jpeg", @headers="Content-Disposition: form-data;
name=\"hotel[attachments_at
tributes][1380289954031][file]\";
filename=\"11374.jpg\"\r\nContent-Type: image/
jpeg\r\n",
@tempfile=#<File:/tmp/RackMultipart20130927-7077-50zkol>>,
"_destroy"=>"false"},
"1380289972216"=>{"file"=>#<ActionDispatch::Http::UploadedFile:0xa5d53a4
@original_filename="357175.jpg", @content_type="image/jpeg",
@headers="Cont
ent-Disposition: form-data;
name=\"hotel[attachments_attributes][1380289972216][
file]\"; filename=\"357175.jpg\"\r\nContent-Type:
image/jpeg\r\n", @tempfile=#<F
ile:/tmp/RackMultipart20130927-7077-dlkmwk>>,
"_destroy"=>"false"}}},
"commit"=>"Done"}Completed 500 Internal Server Error in
109ms
ActiveRecord::UnknownAttributeError (unknown attribute: attachable_type):
  app/controllers/hotels_controller.rb:15:in `new''
  app/controllers/hotels_controller.rb:15:in `create'' 
...

*Model hotel.rb*

class Hotel < ActiveRecord::Base
  attr_accessible :address, :breakfast, :price_for_room, :room_description,
                :star_rating, :title, :attachments_attributes

  has_many :attachments, :as => :attachable
  accepts_nested_attributes_for :attachmentsend

*Model attachment.rb*

class Attachment < ActiveRecord::Base
  attr_accessible :file  
  belongs_to :attachable, :polymorphic => true
  mount_uploader :file, FileUploaderend

*hotels_controller.rb*

...
      def new
        @hotel = Hotel.new
      end
      def create
        @hotel = Hotel.new(params[:hotel])
        if @hotel.save
          redirect_to hotels_path, notice: "Nice, you added new hotel
" + @hotel.title
        else
          render "new"
        end  
      end

*_form.rb*

<%= nested_form_for @hotel, :html => {:multipart => true}  do |f| %>
  ...
  <%= f.fields_for :attachments do |attachment_form|%>    
    <%= attachment_form.label :file %>
    <%= attachment_form.file_field :file %>
    <%= attachment_form.link_to_remove "Remove this photo" %>
  <% end %>
  <%= f.link_to_add "Add photo", :attachments %>
  <%= f.submit ''Done'', class: ''btn
btn-success'' %><% end %>

Any ideas guys? What am I doing wrong here?

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