From 7796bfcdfee4f9f7791226aecd3f16635dfcce92 Mon Sep 17 00:00:00 2001
From: Derek Liang <derekliang@drayalliance.com>
Date: Wed, 22 Apr 2020 21:51:11 -0700
Subject: [PATCH] add id alias for json object to override default _id

---
 packages/moleculer-db-adapter-mongo/src/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/moleculer-db-adapter-mongo/src/index.js b/packages/moleculer-db-adapter-mongo/src/index.js
index 962dfe70..98f88159 100644
--- a/packages/moleculer-db-adapter-mongo/src/index.js
+++ b/packages/moleculer-db-adapter-mongo/src/index.js
@@ -25,7 +25,7 @@ class MongoDbAdapter {
 	 */
 	constructor(uri, opts, dbName) {
 		this.uri = uri,
-		this.opts = opts;
+		this.opts = opts || {};
 		this.dbName = dbName;
 	}
 
@@ -257,7 +257,7 @@ class MongoDbAdapter {
 	entityToObject(entity) {
 		let json = Object.assign({}, entity);
 		if (entity._id)
-			json._id = this.objectIDToString(entity._id);
+			json[this.opts.jsonId ? this.opts.jsonId : "_id"] = this.objectIDToString(entity._id);
 		return json;
 	}