Create Hash with methods for keys. (currently requires ActiveSupport for symbolize_keys :-)

hash_with_method.rb

class HashWithMethod < Hash
  def self.from(hash)
    instance = self.new
    hash.symbolize_keys.each do |key, value|
      case value
      when Hash
        value = self.from(value)
      when Array
        value = value.map { |v| from_any(v) }
      end
      instance[key] = value
      instance.send :define_refer_method, key
      instance.send :define_refer_method, "#{key}?", key if (value.is_a?(TrueClass) || value.is_a?(FalseClass))
    end
    instance
  end
  private
  def self.from_any(object)
    return object unless object.is_a? Hash
    self.from object
  end
  def define_refer_method(key, refkey = nil)
    refkey ||= key
    self.class.send :define_method, key do
      self[refkey]
    end
  end
end

Usage:
h = HashWithMethod.from({a: '1', b: { c: 'xyz' }, t: false })
h.a => 1
h.b.c => 'xyz'
h.t => false
h.t? => false