Persist data in Doctrine DataPersister only if needed

Author: alanpoulain

src/Bridge/Doctrine/Common/DataPersister.php

@@ -51,7 +51,10 @@ public function persist($data)
             return;
         }
 
-        $manager->persist($data);
+        if (!$manager->contains($data)) {
+            $manager->persist($data);
+        }
+
         $manager->flush();
         $manager->refresh($data);
     }