appconfig.rb

require 'yaml'

module MyRailsApp
  module Config
    extend self

    def [](key)
      hash[key.to_sym]
    end

    def hash
      @hash ||= YAML.load(IO.read(Rails.root + "config/application.yml"))[Rails.env.to_s].symbolize_keys
    end

    def method_missing(method, *args)
      if hash.has_key?(method.to_sym)
        hash[method.to_sym]
      else
        super
      end
    end
  end
end