Changelog - Class representation of a project's changelog

changelog.rb

require 'yaml'
require 'ostruct'

class Changelog < OpenStruct
  class Error
    class NoSuchVersion < LoadError; end
  end

  def initialize(version=:latest)
    yaml_file  = File.expand_path('../../Changelog.yml', __FILE__)
    @changelog = YAML.load_file(yaml_file)
    payload    = version.eql?(:latest) ? @changelog.first : find_version(version)
    super payload
  end

  def to_s
    changes.map { |c| "- #{c}" }.join("\n")
  end

private

  def find_version(version)
    payload = @changelog.select { |c| c['version'] == version }.first
    fail Error::NoSuchVersion, "Version '#{version}' not found." if payload.nil?
    payload
  end
end

Changelog.yml

---
-
  version: 5.2.2
  version_code: 5000202
  changes:
    - Fixed an issue where some photo galleries would crash the app
    - Photo credits added
    - High res photos added to stories
    - Other bug fixes
-
  version: 5.2.1
  version_code: 5000201
  changes:
    - Testing
    - Other bug fixes