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ActsAsNestedSet
==============
This acts_as extension provides Nested Set functionality. Nested Set is similiar to Tree, but with the added feature that you can select the children and all of their descendents with a single query. A good use case for this is a threaded post system, where you want to display every reply to a comment without multiple selects.
Example
=======
class Product < ActiveRecord::Base
acts_as_nested_set
end
Copyright (c) 2007 David Heinemeier Hansson, released under the MIT license