not updating if file is not selected in nodejs using multer - node.js

Question

I am trying to update the data. It's working fine if I select the file but there is a problem when I just want to update any field excluding file input type. I am not able to update in such a condition.
How can I resolve it?
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, './public/uploads/')
},
filename: function (req, file, cb) {
cb(null, file.originalname+Date.now()+path.extname(file.originalname))
}
});
var upload = multer({
storage:storage,
});
app.post('/editProfile', auth, upload.single('image'), async (req, res, next) => {
try {
const userEmail = req.user.email;
const name = req.body.name;
const filename = req.file.filename;
const contact = req.body.contact;
console.log(filename + "fghj");
if(filename) {
const edited = await User.updateOne({ 'email': userEmail }, {
$set: {
name: name,
contact: contact,
filename:filename
}
});
}
else {
const edited = await User.updateOne({ 'email': userEmail }, {
$set: {
name: name,
contact: contact,
}
});
}
res.redirect('profile');
}
catch (e) {
console.log(`while edit profile ${e}`);
res.status(400).send(e);
}
})

Answer 1

You are trying to get filename but remember you didn't send a file in your scenario. Here:
const filename = req.file.filename;
First, you should check if a file is exist or not.
You can revise your code like this:
app.post('/editProfile', auth, upload.single('image'), async (req, res, next) => {
try {
const userEmail = req.user.email;
const name = req.body.name;
// const filename = req.file.filename; Remove this line from here
const contact = req.body.contact;
if (req.file) {
const filename = req.file.filename // And, use that code when you make sure that you have a file
const edited = await User.updateOne({ 'email': userEmail }, {
$set: {
name: name,
contact: contact,
filename: filename
}
});
}
else {
const edited = await User.updateOne({ 'email': userEmail }, {
$set: {
name: name,
contact: contact,
}
});
}
res.redirect('profile');
}
catch (e) {
console.log(`while edit profile ${e}`);
res.status(400).send(e);
}
})