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acts_as_tree

============

Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children

association. This requires that you have a foreign key column, which by default is called +parent_id+.

  class Category < ActiveRecord::Base

    acts_as_tree :order => "name"

  end

  Example:

  root

   \_ child1

        \_ subchild1

        \_ subchild2

  root      = Category.create("name" => "root")

  child1    = root.children.create("name" => "child1")

  subchild1 = child1.children.create("name" => "subchild1")

  root.parent   # => nil

  child1.parent # => root

  root.children # => [child1]

  root.children.first.children.first # => subchild1

Copyright (c) 2007 David Heinemeier Hansson, released under the MIT license