view vendor/plugins/acts_as_tree/README @ 120:cd2282d2aa55 cannam

Merge from the default branch.  Note that this is not a valid SVN repository any more (use default, redmine-1.1 etc for SVN updates).

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