Use aequitas as external validator

external_aequitas_validator.rb

module ExternalValidator
  def self.included(descendant)
    descendant.class_eval do
      InstanceMethods
    end
  end
  
  module InstanceMethods
    def initialize(object)
      @object = object
    end

    def method_missing(name,*args,&block)
      super if args.length != 0
      @object[name]
    end
  end
end


class User
  class Validator
    include ExternalValidator
  end

  include Virtus

  attribute :firstname, String

  Validator.validates_presence_of :firstname


  def validator
    Valiator.new(self)
  end

  def valid?
    validator.valid?
  end
end

user = User.new(:firstname => "John")
user.valid? # => true

user.firtname = nil
user.valid? # => false
validator = user.validator
validator.errors # Access error information