Rails - Sep 2009 - acts_as_tree error

I am getting the following error when I attempt to use acts_as_tree. I
am new to this relationship and am stuck.

undefined method `acts_as_tree''

Model
class Rental < ActiveRecord::Base
	acts_as_tree :order => "sort_order"

	validates_presence_of :name
	validates_numericality_of :sort_order
end

Schema
create_table "rentals", :force => true do |t|
    t.string   "name"
    t.integer  "sort_order"
    t.integer  "parent_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

What am I missing?

You have installed the acts_as_tree plugin, right?

   script/plugin install acts_as_tree

(it''s on git://github.com/rails/acts_as_tree.git)

-Rob

On Sep 21, 2009, at 7:36 PM, Jason wrote:
>
> I am getting the following error when I attempt to use acts_as_tree. I
> am new to this relationship and am stuck.
>
> undefined method `acts_as_tree''
>
> Model
> class Rental < ActiveRecord::Base
> 	acts_as_tree :order => "sort_order"
>
> 	validates_presence_of :name
> 	validates_numericality_of :sort_order
> end
>
> Schema
> create_table "rentals", :force => true do |t|
>    t.string   "name"
>    t.integer  "sort_order"
>    t.integer  "parent_id"
>    t.datetime "created_at"
>    t.datetime "updated_at"
>  end
>
> What am I missing?
> >
Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org

script/plugin install acts_as_tree
(git://github.com/rails/acts_as_tree.git)

I didn''t realize it was a plugin. The articles and book I was
following led me to believe it was a native relationship.

Thanks!