From 64b63e9d52924f60af2a938b769fb12631494d3f Mon Sep 17 00:00:00 2001
From: George Pearson <george.pearson@iglu.com>
Date: Fri, 24 May 2019 12:49:04 +0100
Subject: [PATCH] Use update_one instead of deprecated update #1899

---
 mongoengine/document.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mongoengine/document.py b/mongoengine/document.py
index 5ccedbfa..03b659e3 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -502,8 +502,12 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
         update_doc = self._get_update_doc()
         if update_doc:
             upsert = save_condition is None
-            last_error = collection.update(select_dict, update_doc,
-                                           upsert=upsert, **write_concern)
+            with set_write_concern(collection, write_concern) as wc_collection:
+                last_error = wc_collection.update_one(
+                    select_dict,
+                    update_doc,
+                    upsert=upsert
+                ).raw_result
             if not upsert and last_error['n'] == 0:
                 raise SaveConditionError('Race condition preventing'
                                          ' document update detected')