A tree structure for Mongoid documents using the materialized path pattern
mongoid (>= 2.0.0.beta.14)
To install mongoid_tree, simply add it to your Gemfile:
In order to get the latest development version of mongoid-tree:
gem 'mongoid-tree', :git => 'git://github.com/benedikt/mongoid-tree'
You might want to add the :require => 'mongoid/tree' option as well and finally run
Read the API documentation at benedikt.github.com/mongoid-tree and take a look at the Mongoid::Tree module
require 'mongoid/tree' class Node include Mongoid::Document include Mongoid::Tree end
There are several utility methods that help getting to other related documents in the tree:
Node.root Node.roots Node.leaves node.root node.parent node.children node.ancestors node.ancestors_and_self node.descendants node.descendants_and_self node.siblings node.siblings_and_self node.leaves
In addition it's possible to check certain aspects of the documents position in the tree:
node.root? node.leaf? node.depth node.ancestor_of?(other) node.descendant_of?(other)
See Mongoid::Tree for more information on these methods.
It's possible to traverse the tree using different traversal methods. See Mongoid::Tree::Traversal for details
node.traverse(:breadth_first) do |n| # Do something with Node n end
There are two callbacks that are called before and after the rearranging process. This enables you to do additional computations after the documents position in the tree is updated. See Mongoid::Tree for details.
See github.com/benedikt/mongoid-tree and feel free to fork it!
Copyright © 2010 Benedikt Deicke. See LICENSE for details.