# File lib/twitter/base.rb, line 86
      def define_attribute_method(key1, klass = nil, key2 = nil)
        define_method(key1) do ||
          if attr_falsey_or_empty?(key1)
            NullObject.new
          elsif klass.nil?
            @attrs[key1]
          else
            attrs = attrs_for_object(key1, key2)
            Twitter.const_get(klass).new(attrs)
          end
        end
        memoize(key1)
      end