/**
* @param string $slug
* @return null
*/
public function setSlug($slug)
{
if (!isset($this->loadedFields['slug'])) {
$this->loadProperties();
}
$oldValue = null;
if (array_key_exists('slug', $this->loadedValues)) {
$oldValue = $this->loadedValues['slug'];
}
if ($oldValue === $slug) {
$this->slug = $slug;
return;
}
return parent::setSlug($slug);
}
