Rails like presence validator

presence_validator.rb

module PresenceValidator
  attr_reader :errors
  def self.included(base)
    base.extend(ClassMethods)
  end

  private
  def validate
    @errors = []
    options = self.class.options
    attribute = self.class.attribute

    value = self.send(self.class.attribute)
    value.strip! if value && options[:strip]
    if value.nil? || value.empty?
      @errors.push([attribute.to_s, "#{attribute} is required."])
    end
  end

  module ClassMethods
    attr_reader :attribute, :options
    def validates_presence_of(attribute, options)
      options = {} unless options.is_a? Hash
      default_options = {strip: false}
      @options = default_options.merge(options)
      @attribute = attribute
    end
  end
end
module BaseValidator
  def self.included(base)
    base.extend(ClassMethods)
  end
  def valid?
    validate
    @errors.empty?
  end

  module ClassMethods
    VALIDATORS = {
      presence: :validates_presence_of
    }
    def validates(attribute, validations)
      validations.each do |validator, options|
        self.send(VALIDATORS[validator], attribute, options) if options
      end
    end
  end
end

class User
  include BaseValidator
  include PresenceValidator

  attr_accessor :name

  validates :name, presence: {strip: true}
end