User.findOne() is not a function

Question

passport.use('local-signup', new LocalStrategy({
    // by default, local strategy uses username and password, we will override with email
    usernameField : 'email',
    passwordField : 'password',
    passReqToCallback : true // allows us to pass back the entire request to the callback
},
(req, email, password, done) => {
    // asynchronous
    // User.findOne wont fire unless data is sent back
    process.nextTick(() => {

    // find a user whose email is the same as the forms email
    // we are checking to see if the user trying to login already exists
    User.findOne({ 'email' :  email },function(err, user){
        // if there are any errors, return the error

        if (err)
            return done(err);

        // check to see if theres already a user with that email
        if (user) {
            return done(null, false, {'errorMessages': 'That email is already taken.'});
        } else {

            // if there is no user with that email
            // create the user
            let newUser            = new User();

            // set the user's local credentials
            newUser.name       = req.body.fullname;
            //newUser.email          = email;
            newUser.password       = newUser.generateHash(password);


            // save the user
            newUser.save((err)=>{
                if (err)
                    return done(err);
                return done(null, newUser);
            });
        }
    });    
    });
}));

The above code is in node js using passport js authentication and the code of local-signup is not working.

In the above code i am getting the error:

User.findOne() is not a function.

My schema is all right... please help

Answer 1

You need to (if you're not already) create instance of your data with a model like

var UserDetails = mongoose.model('userInfo', UserDetail);

Now you should be able to use .findOne here.

And make sure you're defining structure for your date inside a collection like..

 var Schema = mongoose.Schema;
 var UserDetail = new Schema({
  username: String,
  password: String
}, {
  collection: 'userInfo'
});

Answer 2

Kindly, use the code below

module.exports = User = mongoose.model('user', UserSchema)

User should be the model name and remember to define const UserSchema = new Schema at the top to create a new model in MongoDB and

user should the route where you have the

router.post('/user') (req, res) => { code here }

with this, you are exporting the mongoose schema to the route user, this which enables findOne to be seen as a mongoose function.

Answer 3

maybe you did not export the Model from your User model folder. eg: module.exports = User = mongoose.model("users", UserSchema);

Answer 4

Export the user Model from models directory from file named user.js.

module.exports.User = User

Then Load User model from any other

const {User} = require('../models/user.js');

Note : I'm assuming user models file is named user.js