README
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Jean-Philippe Lang
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r962 | 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 |