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openproject/lib/plugins/acts_as_tree
Alex Coles bdbb3c6a6a Migrate acts_as_tree has_many to lambda 9 years ago
..
lib/active_record/acts Migrate acts_as_tree has_many to lambda 9 years ago
test Migrate AR finder/query methods in lib code 9 years ago
README DEPRECATION FIX: moved plugins to lib folder as suggested by the deprecation warning 12 years ago
Rakefile Fix syntax (w/Rubocop) in lib code 10 years ago
init.rb DEPRECATION FIX: moved plugins to lib folder as suggested by the deprecation warning 12 years ago

README

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