protected function validateRelation($name, $jory): void
    {
        if (empty($name)) {
            throw new JoryException('A relations name should not be empty. (Location: '.$this->address.'relations)');
        }
        // The data in $jory is another jory array, validate recursive with new validator.
        (new self($jory, $this->address.$name))->validate();
    }