gistfile1.rb

> ruby --version
ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-linux]

> cat validate_test.rb 
require 'not_naughty'

Person = Struct.new(:name) do
  extend NotNaughty
  validates(:name) { presence and length :minimum => 4 }
end

Person.new('Horst').valid? # => true
Person.new('Foo').valid? # => false

> ruby validate_test.rb 
validate_test.rb:5: undefined local variable or method `presence' for #<NotNaughty::ClassMethods::Builder:0xb7a5ce60> (NameError)
	from /home/kiko/projects/others/not-naughty/lib/not_naughty/class_methods.rb:23:in `instance_eval'
	from /home/kiko/projects/others/not-naughty/lib/not_naughty/class_methods.rb:23:in `validates'
	from validate_test.rb:5
	from validate_test.rb:3:in `new'
	from validate_test.rb:3