From a45012fbba42bc275d68c6ebf93dd3ec6cff7d2b Mon Sep 17 00:00:00 2001
From: Maksim Kotlyar <kotlyar.maksim@gmail.com>
Date: Wed, 22 Mar 2017 14:43:54 +0200
Subject: [PATCH] Do not perform update when no changes found.

---
 src/Storage.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Storage.php b/src/Storage.php
index 590a04f..3881e51 100644
--- a/src/Storage.php
+++ b/src/Storage.php
@@ -115,6 +115,9 @@ public function update($model, $filter = null, array $options = [])
         }
 
         $update = $this->changesCollector->changes($model);
+        if (empty($update)) {
+            return;
+        }
 
         $result = $this->collection->updateOne($filter, $update, $options);
         if (false == $result->isAcknowledged()) {