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?
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