/**
* @param Folder $folder The folder object to add.
*/
protected function doAddFolder($folder)
{
$contentFolder = new ChildContentFolder();
$contentFolder->setFolder($folder);
$this->addContentFolder($contentFolder);
// set the back reference to this object directly as using provided method either results
// in endless loop or in multiple relations
if (!$folder->getContents()->contains($this)) {
$foreignCollection = $folder->getContents();
$foreignCollection[] = $this;
}
}
