user.setPassword is not a function - express

Question

I'm trying to change the user's password with the setPassword() passport local mongoose instance method, but I'm getting an error that says "user.setPassword is not a function".
This is my code
const change_password = (req, res) => {
const password = req.body.password
console.log(password);
User.find({
_id: req.user._id
}).then((user) => {
user.setPassword(password, function() {
console.log('user password changed')
user.save()
res.status(200).json( { msg : 'The password has been changed' })
})
}).catch(e => {
console.log(e);
})
}
And this is my user Schema
const mongoose = require('mongoose');
const passportLocalMongoose = require('passport-local-mongoose');
const UserSchema = new mongoose.Schema({
name: {
type: String,
// required: true
},
googleId: {
type: String,
},
photoUrl: {
type: String,
},
githubId: {
type: String,
},
twitterId: {
type: String,
},
facebookId: {
type: String,
},
bio: {
type: String,
},
email: {
type: String,
},
phoneNumber: {
type: String,
},
})
UserSchema.plugin(passportLocalMongoose, { usernameField: 'email' });
const User = mongoose.model('User', UserSchema);
module.exports = User;

Answer 1

User.find() will return an array of users matching the query, hence the error.
Because there should be (at most) one user in the database matching req.user._id, use findOne instead. Also note that findOne() can return null in case there were no users matching the query:
User.findOne({ _id: req.user._id }).then(user => {
if (! user) return res.sendStatus(404);
user.setPassword(…);
});