symfony - unique slugs with multi entities in symfony2 -

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i have small symfony2 application user can create pages. each page should accessible via route /{user_slug}/{page_slug}. have entities user , page , use sluggable behavior both entities. in order find correct page combination of user_slug , page_slug has unique.

what best way check combination of user_slug , page_slug uniqe?

try in prepository:

public function findbyusernameandslug($username, $slug) {     $em = $this->getentitymanager();     $query = $em->createquery("         select g         acme\pagesbundle\entity\page p         join p.owner u         u.username = :username         , p.slug = :slug     ")             ->setparameter('username', $username)             ->setparameter('slug', $slug);      foreach ($query->getresult() $goal) {         return $goal;     }      return null; }

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