calendar_title.rb

class CalendarTitle < ApplicationRecord
  cattr_accessor :definition_file
  self.definition_file = "#{Rails.root}/db/static_data/event_titles.yml"
  include Findable
end

findable.rb

module Findable
  extend ActiveSupport::Concern

  included do
    findable = ActiveSupport::OrderedOptions.new

    YAML.load_file(definition_file).each do |category, data|
      data.each do |datum|
        thing = Thing.new(path: [category], **datum.deep_symbolize_keys)
        findable[thing.ident] = thing
      end
    end

    class_attribute :findable, default: findable
  end

  class_methods do
    def find_by_identifier(ident)
      puts findable[ident].title
    end
  end

  class Thing
    attr_reader :path, :name, :title, :ident

    def initialize(path:, name:, title:)
      @path  = path
      @name  = name
      @title = title

      @ident = build_identity
    end

    protected

    PATH_SEPARATOR = '_'

    def build_identity
      [*path, name].map(&:to_s).join PATH_SEPARATOR
    end
  end
end