Includes Ohm::NumberValidations and Ohm::WebValidations.
Examples:
class Post < Ohm::Model include Ohm::ExtraValidations attribute :price attribute :state attribute :slug attribute :author_email attribute :url attribute :ipaddr def validate super assert_decimal :price assert_member :state, ['published', 'unpublished'] assert_ipaddr :ipaddr assert_url :url assert_email :author_email end end post = Post.new post.valid? post.errors # [[:price, :not_decimal], [:state, :not_member], [:ipaddr, :not_ipaddr], # [:url, :not_url], [:author_email, :not_email]]