This gem provides support for creating tree data structures. The structure of the tree is defined with dot delimited paths on each node. This has a couple of advantages over the acts_as_tree plugin.
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Each node gets a unique character identifier that has semantic qualities and indicates the structure in the tree.
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Queries for all ancestors or all descendants are far more efficient.
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Out of the box the code works with ActiveRecord, but it can easily be made to work with other ORM’s if they implement just a few methods.
See PathTree for more details.