Error uploading multiple images in node.js - node.js

Question

I am trying to upload images in mongo db but after clicking on send in postman it shows "img": null
I am using flutter for frontend so I want to make a rest api I am able to upload single image but when I am trying to upload multiple images it shows
"img": null
I have also created a schema
where I have set
img:{
type: array,
default:"",
}
const express = require("express");
const router = express.Router();
const Profile = require("../models/profile.model");
const middleware = require("../middleware");
const multer = require("multer");
const path = require("path");
const storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, "./uploads");
},
filename: (req, file, cb) => {
cb(null, req.decoded.username + ".jpg");
},
});
const fileFilter = (req, file, cb) => {
if (file.mimetype == "image/jpeg" || file.mimetype == "image/png") {
cb(null, true);
} else {
cb(null, false);
}
};
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 6,
},
// fileFilter: fileFilter,
});
//adding and update profile image
router
.route("/add/image")
.patch(middleware.checkToken, upload.array("img",5), (req, res) => {
Profile.findOneAndUpdate(
{ username: req.decoded.username },
{
$set: {
img: req.files.path,
},
},
{ new: true },
(err, profile) => {
if (err) return res.status(500).send(err);
const response = {
message: "image added successfully updated",
data: profile,
};
return res.status(200).send(response);
}
);
});

Answer 1

when you upload multiple images, multer create a array of object like this :
req.files : [{…}, {…}, {…}]
that one of the property of objects is path, so there are many way to insert to path in img.
if type of img defined array [] in schema you can do like this in findOneAndUpdate :
{
$set: {
img: req.files.map(file => file.path),
},
}