Mike devmug
equivalent
/ app-model-document.rb
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October 29, 2018 07:47
Recursion example in Ruby on Rails model. Recursion will generate array of parents parents
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| class Document < ActiveRecord::Base | |
| belongs_to :parent, class_name: 'Document' | |
| def self.get_ancestors(who) | |
| @tree ||= [] | |
| # @tree is instance variable of Document class object not document instance object | |
| # so: Document.get_instance_variable('@tree') | |
| if who.parent.nil? |
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/d3-collapsible-tree |
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| module BinaryTree | |
| class Node | |
| attr_reader :word, :count, :left, :right | |
| include Enumerable | |
| def initialize(word) | |
| @word, @count = word, 1 | |
| end |