Pimcore\Model\Document::correctPath PHP Method

    public function correctPath()
    {
        // set path
        if ($this->getId() != 1) {
            // not for the root node
            // check for a valid key, home has no key, so omit the check
            if (!Element\Service::isValidKey($this->getKey(), "document")) {
                throw new \Exception("invalid key for document with id [ " . $this->getId() . " ] key is: [" . $this->getKey() . "]");
            }
            if ($this->getParentId() == $this->getId()) {
                throw new \Exception("ParentID and ID is identical, an element can't be the parent of itself.");
            }
            $parent = Document::getById($this->getParentId());
            if ($parent) {
                // use the parent's path from the database here (getCurrentFullPath), to ensure the path really exists and does not rely on the path
                // that is currently in the parent object (in memory), because this might have changed but wasn't not saved
                $this->setPath(str_replace("//", "/", $parent->getCurrentFullPath() . "/"));
            } else {
                // parent document doesn't exist anymore, set the parent to to root
                $this->setParentId(1);
                $this->setPath("/");
            }
            if (strlen($this->getKey()) < 1) {
                throw new \Exception("Document requires key, generated key automatically");
            }
        } elseif ($this->getId() == 1) {
            // some data in root node should always be the same
            $this->setParentId(0);
            $this->setPath("/");
            $this->setKey("");
            $this->setType("page");
        }
        if (Document\Service::pathExists($this->getRealFullPath())) {
            $duplicate = Document::getByPath($this->getRealFullPath());
            if ($duplicate instanceof Document and $duplicate->getId() != $this->getId()) {
                throw new \Exception("Duplicate full path [ " . $this->getRealFullPath() . " ] - cannot save document");
            }
        }
        if (strlen($this->getRealFullPath()) > 765) {
            throw new \Exception("Full path is limited to 765 characters, reduce the length of your parent's path");
        }
    }