YAML loading in ruby 2.1

config.yml

default: &default
  adapter: postgresql
  encoding: unicode
  pool: 5
  username: root
  password:

development:
  <<: *default
  database: db_development

test:
  <<: *default
  database: db_test

production:
  <<: *default
  database: db_production

yaml.rb

require "yaml"

# config_path = File.expand_path("../config.yml", __FILE__)

# new way in ruby 2.0+
config_path = File.expand_path("config.yml", __dir__)

config = YAML.load_file(config_path)

p config["development"]["database"]
p config["test"]["database"]
p config["production"]["database"]