/**
* {@inheritdoc}
*
* @return void
*/
public function beforeSave()
{
// title validator
$this->addValidator('title', v::required(), v::length(2, 128));
//description validator
$this->addValidator('description', v::required(), v::length(2, 250), v::string());
//category validator
$this->addValidator('categoryId', v::required(), v::integer());
//cost validator
$this->addValidator('cost', v::required(), v::float(), v::min(0.01, true));
}