Sokil\Mongo\Validator\NotEqualsValidator::validateField PHP Метод

    public function validateField(Structure $document, $fieldName, array $params)
    {
        if (!$document->get($fieldName)) {
            return;
        }
        if ($document->get($fieldName) !== $params['to']) {
            return;
        }
        if (!isset($params['message'])) {
            $params['message'] = 'Field "' . $fieldName . '" must be equals to "' . $params['to'] . '" in model ' . get_called_class();
        }
        $document->addError($fieldName, $this->getName(), $params['message']);
    }