benedikt/mongoid-tree

stefankroes/ancestry

Organise ActiveRecord model into a tree structure

3873 stars

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django-mptt/django-mptt

Utilities for implementing a modified pre-order traversal tree in django.

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1and1/acts_as_recursive_tree

Make use of recursive queries in Rails when using Postgresql or SQLite

86 stars

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mongoid/mongoid-history

Multi-user non-linear history tracking, auditing, undo, redo for mongoid.

392 stars

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amerine/acts_as_tree

ActsAsTree -- Extends ActiveRecord to add simple support for organizing items into parent–children relationships.

597 stars

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mongodb/mongoid

The Official Ruby Object Mapper for MongoDB

3917 stars

Ruby 1 awesome list