diff -r 11fd79666374 -r 8551d844b4f3 Entity/DocumentRepository.php
--- a/Entity/DocumentRepository.php	Fri Nov 04 15:59:49 2011 +0100
+++ b/Entity/DocumentRepository.php	Sun Nov 06 23:44:37 2011 +0100
@@ -185,17 +185,26 @@
         }
     }
     
+    function getTagsStr($document)
+    {
+        $em = $this->getEntityManager();
+        $query = $em->createQuery("SELECT t.label FROM WikiTagBundle:DocumentTag dt JOIN dt.tag t WHERE dt.document = :docid");
+        $query = $query->setParameter("docid", $document);
+        $result = $query->getScalarResult();
+        $tagstr = array();
+        foreach ($result as $res) {
+            $tagstr[] = $res['label'];
+        }
+        return $tagstr;
+    }
+    
     function updateTagsStr($document)
     {
-        $tags_str = array();
-        foreach($document->getTags() as $tag)
-        {
-            $tags_str[] = $tag->getTag()->getLabel();
-        }
+        
+        $tagstr = $this->getTagsStr($document);
         
-        $document->setTagsStr(implode(",",$tags_str));
-        
-        $this->getEntityManager()->flush();
+        $document->setTagsStr(implode(",",$tagstr));
+        $this->getEntityManager()->persist($document);
     }
         
 }
\ No newline at end of file