ActiveRecord::UnknownAttributeError

Je suis en train de créer hôtel avec certains champs, l'un des champs est de la photo, je veux utiliser plusieurs fichiers à télécharger avec carrierwave et nested_form. J'ai trouvé ce l'article
et avoir un résultat.

Quand je suis sur /hotels/nouvelle, en remplissant les champs, le choix des photos
et appuyez sur soumettre, se ActiveRecord::UnknownAttributeError dans HotelsController#créer attribut inconnu: attachable_type.
Console

Started POST "/hotels" for 127.0.0.1 at 2013-09-27 17:35:18 +0300
Processing 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:0xa5d
53a4 @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' 
...

Modèle de l'hôtel.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 :attachments
end

Modèle de pièce jointe.rb

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

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 %>

Toutes les idées, les gars? Ce que je fais mal?

OriginalL'auteur yozzz | 2013-09-27