gistfile1.rb

require 'lotus/validations'

module UserValidations
  include Lotus::Validations

  attribute :login, presence: true, format: /[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}/
  attribute :password, presence: true, confirmation: true, size: 8..64
end

class User
  include UserValidations
end

>> u = User.new({})
=> #<User:0x007fb57b95def8 @attributes={}, @errors=#<Lotus::Validations::Errors:0x007fb57b95dea8 @errors={}>>
>> u.valid?
NoMethodError: undefined method `attributes' for User:Class
	from /Users/gotar/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/lotus-validations-0.1.0/lib/lotus/validations.rb:395:in `_attributes'
	from /Users/gotar/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/lotus-validations-0.1.0/lib/lotus/validations.rb:361:in `valid?'
	from (irb):2
	from /Users/gotar/.rbenv/versions/2.1.5/bin/irb:11:in `<main>'