require 'mongoid' module Mongoid class PathExtension < String delegate(:permalink, to: :parent, prefix: true) def initialize(str) super str.to_s @str = str.to_s end def components return [] unless @str.present? @str.split('/') end def root components.first end def permalink components.last end def permalink=(value) return if value.blank? new_str = [parent.to_s, value].join('/') @str.replace(new_str) end def absolute ['/', @str].join end def has_parent? parent.present? end def parent ancestors.last end alias_method :parent_path, :parent def ancestors components[0..-2].each_with_index.map do |component, index| Mongoid::PathExtension.new(components[0..index].join('/')) end end alias_method :ancestor_paths, :ancestors class << self def demongoize(value) PathExtension.new(value) end def mongoize(value) case value when PathExtension then value.mongoize else value end end def evolve(value) case value when PathExtension then value.mongoize else value end end end end end