public function validateRange($min_amount, $max_amount)
    {
        $this->validator_attributes[] = 'data-parsley-range="[' . (float)$min_amount . ', ' . (float)$max_amount . ']"';

        $this->validator_checks['min'] = (float)$min_amount;
        $this->validator_checks['max'] = (float)$max_amount;

        return $this;
    }