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26 lines
779 B
Plaintext
26 lines
779 B
Plaintext
acts_as_tree
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============
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Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
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association. This requires that you have a foreign key column, which by default is called +parent_id+.
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class Category < ActiveRecord::Base
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acts_as_tree :order => "name"
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end
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Example:
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root
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\_ child1
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\_ subchild1
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\_ subchild2
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root = Category.create("name" => "root")
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child1 = root.children.create("name" => "child1")
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subchild1 = child1.children.create("name" => "subchild1")
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root.parent # => nil
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child1.parent # => root
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root.children # => [child1]
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root.children.first.children.first # => subchild1
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Copyright (c) 2007 David Heinemeier Hansson, released under the MIT license |