acts_as_tree (for rails3)
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
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 © 2007 David Heinemeier Hansson, released under the MIT license