extending an apipie-rails validator

Question

I'd like to extend NumberValidator to also validate for min and max values. I'd like to still call the default NumberValidator and have it return its own description (Must be a number) should it fail. Right now, I'm always getting my own implementation's description ('Must be a number between...`)

This is what I have thus far:

class NumberValidator < Apipie::Validator::BaseValidator

  def initialize(param_description, argument, options)
    super(param_description)
    @number_validator = Apipie::Validator::NumberValidator.new(param_description)
    @type = argument
    @options = options
  end

  def validate(value)
    return false unless @number_validator.valid?(value)

    if (@options[:min]) && (@options[:max])
      self.class.validate(value) && value.to_i.between?(@options[:min], @options[:max])
    end

    true
  end

  def self.build(param_description, argument, options, block)
    if argument == :number
      self.new(param_description, argument, options)
    end
  end

  def description
    "Must be a number between #{@options[:min]} and #{@options[:max]}."
  end
end