To find, modify, and save with Mongoose and JavaScript, we call findOne and save.
For instance, we write
User.findOne({ username: oldUsername }, (err, user) => {
user.username = newUser.username;
user.password = newUser.password;
user.rights = newUser.rights;
user.save((err) => {
if (err) {
console.error("ERROR!");
}
});
});
to call findOne to find the object with the username set to oldUsername.
In the callback, we set the property values for user.
And then we call user.save to save the values.
