Doctrine\OXM\Event\PreUpdateEventArgs::assertValidField PHP Method

    private function assertValidField($field)
    {
        if (!isset($this->entityChangeSet[$field])) {
            throw new \InvalidArgumentException("Field '" . $field . "' is not a valid field of the entity " . "'" . get_class($this->getXmlEntity()) . "' in PreInsertUpdateEventArgs.");
        }
    }