Arboreal is yet another extension to ActiveRecord to support tree-shaped data structures. Internally, Arboreal maintains a computed "ancestry_string" column, which caches the path from the root of a tree to each node, allowing efficient retrieval of both ancestors and descendants. Arboreal surfaces relationships within the tree like "children", "ancestors", "descendants", and "siblings" as scopes, so that additional filtering/pagination can be performed.

Syntax Tree support for RBS

A syntax_tree plugin for force syntax_tree to using bracket array

TreeStruct allows to describe a structure with nested TreeStruct and with arrays of TreeStruct. The level of nesting is not limited.

Pure-Ruby implemention of Red-Black tree, a self-balancing binary search tree with O(log n) search, insert and delete operations.

Ive been consistently dissappointed with how limited normal decision trees, and how it's not really possible use both normal decision trees, and multi-factor trees in the same algorithm. Enter Dynamic Tree, which allows you to run a multi factor test and a single factor test for each individual factor in the same movement.

Ruby bindings for Tree-Sitter

A high-level Ruby wrapper for the Tree-sitter bindings

Syntax Tree support for ERB

ArchiveTree is a Ruby Gem that makes it easy for you to create beautiful chronological archive trees of your models. For instance, you can create a tree for your blog posts.

Implements treeview via jquery.treeview for models using acts_as_tree.

Translate Syntax Tree into other representations

Implement orderable trees in ActiveRecord using the nested set model, with multiple roots and scoping, and most importantly user-defined ordering of subtrees. Fetches preordered trees in one go, updates are write-heavy. This is a substantially butchered-up version/offspring of acts_as_threaded. The main additional perk is the ability to reorder nodes, which are always fetched ordered. Example: root = Folder.create! :name => "Main folder" subfolder_1 = Folder.create! :name => "Subfolder", :parent_id => root.id subfolder_2 = Folder.create! :name => "Another subfolder", :parent_id => root.id subfolder_2.move_to_top # just like acts_as_list but nestedly awesome root.all_children # => [subfolder_2, subfolder_1] See the rdocs for examples the method names. It also inherits the awesome properties of acts_as_threaded, namely materialized depth, root_id and parent_id values on each object which are updated when nodes get moved. Thanks to the authors of acts_as_threaded, awesome_nested_set, better_nested_set and all the others for inspiration.

Implement orderable trees in ActiveRecord using the nested set model, with multiple roots and scoping, and most importantly user-defined ordering of subtrees. Fetches preordered trees in one go, updates are write-heavy. This is a substantially butchered-up version/offspring of acts_as_threaded. The main additional perk is the ability to reorder nodes, which are always fetched ordered. Example: root = Folder.create! :name => "Main folder" subfolder_1 = Folder.create! :name => "Subfolder", :parent_id => root.id subfolder_2 = Folder.create! :name => "Another subfolder", :parent_id => root.id subfolder_2.move_to_top # just like acts_as_list but nestedly awesome root.all_children # => [subfolder_2, subfolder_1] See the rdocs for examples the method names. It also inherits the awesome properties of acts_as_threaded, namely materialized depth, root_id and parent_id values on each object which are updated when nodes get moved. Thanks to the authors of acts_as_threaded, awesome_nested_set, better_nested_set and all the others for inspiration.

Syntax Tree support for JSON

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Syntax Tree support for Brainf***

NdcTree is a library outputs a list of NDC(Nippon Decimal Classification) as a tree-structured data.

This module implements ordered n-ary branching tree structures. It includes support for breadth- and depth- first iteration, and serialization to and from a bracketed tree string.

Syntax Tree support for XML