ruby on rails - undefined method for _path, but route exists -

i getting rails error when create new "car_image"... ajax response is

undefined method `car_image_path' #<carimage:0x007fdbb1b79258> 

route defined

resources :car_images, :only => [:index, :create, :destroy] 

rake routes

car_images    /car_images(.:format)                  car_images#index post   /car_images(.:format)                  car_images#create car_image delete /car_images/:id(.:format)              car_images#destroy 

however, route setup , can see when rake routes, not sure issue is. using route in model method:

class carimage < activerecord::base   belongs_to :car    attr_accessible :description, :image, :title, :car_id, :file    mount_uploader :file, carimageuploader    def to_jq_upload     {       "name" => read_attribute(:file),       "size" => file.size,       "url" => file.url,       "thumbnail_url" => file.thumb.url,       "delete_url" => car_image_path(:id => id),       "delete_type" => "delete"      }   end  end 

what causing undefined method here? record save, error response...

since need link in model (which should not be), add inside:

delegate :url_helpers, to: 'rails.application.routes' 

then replace:

car_image_path(:id => id) 

with:

url_helpers.car_image_path(self)