MongoDB issue with saving value returned from findByID - mongodb

Question

I have an issue with function which update password. What I would like to have is a function which will update logged user data.
export const updateMe = async (req, res, next) => {
if (!req) {
res.status(400).end()
}
try {
const updatedDoc = await User.findById(req.user._id, function(err, doc) {
if (err) return next(err)
doc.password = req.body.password
doc.save()
})
.lean()
.exec()
res.status(200).json({ data: updatedDoc })
} catch (e) {
console.log(e)
res.status(400).end()
}
}
I have written middleware which will hash password before it will be saved.
userSchema.pre('save', function(next) {
if (!this.isModified('password')) {
return next()
}
bcrypt.hash(this.password, 8, (err, hash) => {
if (err) {
return next(err)
}
this.password = hash
next()
})
})
I do not know why error is always reciving with message "doc.save() is not a funcition"

Answer 1

You are mixing promise and await code, also doc.save() returns a promise so you need to await it.
( I assume you are already setting req.user._id in a middleware, and it is not null.)
So your method must be like this if async/await is used:
export const updateMe = async (req, res, next) => {
if (!req.body.password) {
return res.status(400).send("Password is required");
}
try {
let updatedDoc = await User.findById(req.user._id);
updatedDoc.password = req.body.password;
updatedDoc = await updatedDoc.save();
res.status(200).json({ data: updatedDoc });
} catch (e) {
console.log(e);
res.status(400);
}
};