Merge pull request #275 from frne/frontend-link-extension-routing-fix

Fixes error with unperisted dynamic route in sonata FrontendLinkExtension

Admin/Extension/FrontendLinkExtension.php

@@ -15,6 +15,7 @@
 use Sonata\AdminBundle\Admin\AdminExtension;
 use Sonata\AdminBundle\Admin\AdminInterface;
 use Symfony\Bundle\FrameworkBundle\Translation\Translator;
+use Symfony\Cmf\Bundle\RoutingBundle\Doctrine\Phpcr\PrefixInterface;
 use Symfony\Cmf\Component\Routing\RouteReferrersReadInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\Routing\Exception\ExceptionInterface as RoutingExceptionInterface;
@@ -68,6 +69,11 @@ public function configureTabMenu(
             );
         }
 
+        if ($subject instanceof PrefixInterface && !is_string($subject->getId())) {
+            // we have an unpersisted dynamic route 
+            return; 
+        }
+
         try {
             $uri = $this->router->generate($subject);
         } catch (RoutingExceptionInterface $e) {