public function validateRangeCheckboxesChecked($min_count, $max_count)
    {
        $this->validator_attributes[] = 'data-parsley-check="[' . (int)$min_count . ', ' . (int)$max_count . ']"';

        $this->validator_checks['min_checkboxes_checked'] = (int)$min_count;
        $this->validator_checks['max_checkboxes_checked'] = (int)$max_count;

        return $this;
    }