public function findMembership($slug, User $user)
 {
     $membership = Project::fetchMembership($this->conn, $this->resolver, $slug, $user->getId());
     if (false === $membership) {
         throw new ItemNotFoundException('The specified project is not available.', $slug);
     }
     $user->addRole('ROLE_PROJECT_AWARE');
     return $membership;
 }