Mpociot\Versionable\VersionableTrait::versionablePostSave PHP Method

    protected function versionablePostSave()
    {
        /**
         * We'll save new versions on updating and first creation
         */
        if ($this->versioningEnabled === true && $this->updating && $this->isValidForVersioning() || $this->versioningEnabled === true && !$this->updating && count($this->versionableDirtyData)) {
            // Save a new version
            $version = new Version();
            $version->versionable_id = $this->getKey();
            $version->versionable_type = get_class($this);
            $version->user_id = $this->getAuthUserId();
            $version->model_data = serialize($this->getAttributes());
            if (!empty($this->reason)) {
                $version->reason = $this->reason;
            }
            $version->save();
        }
    }