Mercurial > hg > soundsoftware-site
view vendor/plugins/acts_as_tree/README @ 669:202986dd17e4 live bibliography_plugin_alpha
Merge from branch "cannam_integration"
author | Chris Cannam |
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date | Fri, 09 Sep 2011 16:56:21 +0100 |
parents | 513646585e45 |
children |
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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