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
.
Install¶ ↑
gem install mdeering-acts_as_tree
Example¶ ↑
class Category < ActiveRecord::Base acts_as_tree :order => "name", :before_add => :do_something private def do_something(child) # add your actions here... end 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 © 2007 David Heinemeier Hansson, released under the MIT license