From e86cf962e99e15eaa59e14380ff50fd9e25ac6fc Mon Sep 17 00:00:00 2001
From: Erdenezul Batmunkh <erdenezul.b@gmail.com>
Date: Wed, 21 Aug 2019 13:08:30 +0200
Subject: [PATCH] Change misleading error message

---
 mongoengine/queryset/base.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mongoengine/queryset/base.py b/mongoengine/queryset/base.py
index ba3ac95a..46b20d78 100644
--- a/mongoengine/queryset/base.py
+++ b/mongoengine/queryset/base.py
@@ -355,8 +355,8 @@ class BaseQuerySet(object):
         except pymongo.errors.BulkWriteError as err:
             # inserting documents that already have an _id field will
             # give huge performance debt or raise
-            message = u"Document must not have _id value before bulk write (%s)"
-            raise NotUniqueError(message % six.text_type(err))
+            message = u"Bulk write error: (%s)"
+            raise NotUniqueError(message % six.text_type(err.details))
         except pymongo.errors.OperationFailure as err:
             message = "Could not save document (%s)"
             if re.match("^E1100[01] duplicate key", six.text_type(err)):