Added a migration to set the slugs.

app/DoctrineMigrations/Version20140710120656.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\ORM\EntityManager;
+use Hackspace\Bundle\CalciferBundle\Entity\Event;
+use Hackspace\Bundle\CalciferBundle\Entity\Location;
+use Hackspace\Bundle\CalciferBundle\Entity\Tag;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+class Version20140710120656 extends AbstractMigration implements ContainerAwareInterface
+{
+    /** @var  ContainerInterface */
+    private $container;
+
+    public function setContainer(ContainerInterface $container = null)
+    {
+        $this->container = $container;
+    }
+
+    public function up(Schema $schema)
+    {
+        /** @var EntityManager $em */
+        $em = $this->container->get('doctrine.orm.entity_manager');
+        $repo = $em->getRepository('CalciferBundle:Event');
+        $entities = $repo->findAll();
+        if (count($entities) > 0) {
+            foreach($entities as $entity) {
+                /** @var Event $entity */
+                $entity->setSlug(\URLify::filter($entity->getSummary(),255,'de'));
+                $em->persist($entity);
+                $em->flush();
+            }
+        }
+
+        $repo = $em->getRepository('CalciferBundle:Location');
+        $entities = $repo->findAll();
+        if (count($entities) > 0) {
+            foreach($entities as $entity) {
+                /** @var Location $entity */
+                $entity->setSlug(\URLify::filter($entity->getName(),255,'de'));
+                $em->persist($entity);
+                $em->flush();
+            }
+        }
+
+
+        $repo = $em->getRepository('CalciferBundle:Tag');
+        $entities = $repo->findAll();
+        if (count($entities) > 0) {
+            foreach($entities as $entity) {
+                /** @var Tag $entity */
+                $entity->setSlug(\URLify::filter($entity->getName(),255,'de'));
+                $em->persist($entity);
+                $em->flush();
+            }
+        }
+
+
+    }
+
+    public function down(Schema $schema)
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+
+    }
+}