Doctrine Extension Slug : avoid duplication - symfony

Question

I'm using doctrine and sf2 and i have a question about the slug extension :
Is there any way to generate it before the flush ?
Let say i have a Brand Entity:
/**
* Brand
*
* #ORM\Table(indexes={#ORM\Index(name="name_idx", columns={"name"})})
* #ORM\Entity(repositoryClass="Shoesalley\Bundle\CoreBundle\Entity\BrandRepository")
*/
class Brand
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* #var string
*
* #Gedmo\Slug(fields={"name"})
* #ORM\Column(length=128, unique=true)
*/
private $slug;
}
// getters and setters ...
if i do this i get 2 differents slugs : test and test_1
$brand=new Brand();
$brand->setName('test');
$em->persist($brand);
$brand2=new Brand();
$brand2->setName('Test');
$em->persist($brand2);
The goal would be to find that the target slug allready exist and only have 1 DB Entry.
I can't use find() without a generated slug, so does anyone have an idea ?
The main idea is something like that, but i don't know how to implement it :
$brand=new Brand();
$brand->setName('test');
$slug = $brand->getSlug();
if( $oBrand = $em->getRepository("DemoBundle:Brand")->findOneBySlug($slug)){
$brand = $oBrand;
}
$em->persist($brand);
Thanks a lot for your help.

Answer 1

You are using the right logic in your solution i think; there are probalbly a few glitches you need to take care of though :
$brand = new Brand();
$brand->setName('test');
$slug = $brand->getSlug();
// Is getSlug() going to work before persist ?
// If not, you'll have to "simulate" the generation of a slug
// to obtain a string equivalent to that slug
$obrand = $em->getRepository("DemoBundle:Brand")->findOneBySlug($slug);
if(empty($obrand) { // empty, or is_null, depends on what your orm returns when it finds nothing
$em->persist(brand);
} else {
echo('Slug ' . $brand->getSlug() . ' is already in use !');
}