Adding default callback for serialization if serialization is turned on

Serializer/Callback.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace FOQ\ElasticaBundle\Serializer;
+
+class Callback
+{
+    protected $serializer;
+
+    protected $groups;
+
+    public function setSerializer($serializer){
+        $this->serializer = $serializer;
+    }
+
+    public function setGroups($groups){
+        $this->groups = $groups;
+    }
+
+    public function serialize($object)
+    {
+        $this->serializer->setGroups(null);
+        $this->serializer->setGroups($this->groups);
+        return $this->serializer->serialize($object, 'json');
+    }
+}