From ab8b347a92de3a0a5b3c6cd6556a32108a118c0a Mon Sep 17 00:00:00 2001
From: frankast <borodaev97@gmail.com>
Date: Wed, 9 Jan 2019 17:30:20 +0600
Subject: [PATCH] fix(index): force increment version of doc

---
 src/index.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/index.js b/src/index.js
index e381c38..b541a17 100644
--- a/src/index.js
+++ b/src/index.js
@@ -8,6 +8,7 @@ import DiffModel from './DiffModel';
 import { getExcludedFields } from './utils';
 
 export default function plugin(schema: MongooseSchema<any>, options?: OptionsT) {
+  // $FlowFixMe
   if (!schema.options.versionKey)
     throw new Error(`You must provide 'versionKey' option to your schema or remain it as default`);
 
@@ -26,8 +27,8 @@ export default function plugin(schema: MongooseSchema<any>, options?: OptionsT)
   });
 
   schema.pre('save', async function() {
-    // && this._original
-    if (!this.isNew) {
+    if (!this.isNew && this._original) {
+      await this.increment();
       const lhs = this._original;
       const rhs = this.toObject();
       const version = this[versionKey] + 1; // cause we're inside preSave hook