User.js
const mongoose = require('mongoose');
var bcrypt = require('bcryptjs');

const userSchema = mongoose.Schema({
    userName:  {
        type: String,
        required: true
    },
    email:   {
        type: String,
        required: true
    },
    password:   {
        type: String,
        required: true,
        bcrypt: true
    },
    type:   {
        type: String,
        required: true
    },
    dateJoined:    {
        type: Date,
        default: Date.now
    }
});

var User = module.exports = mongoose.model('User', userSchema);

// Fetch events
module.exports.getUsers = function(callback, limit)   {
    User.find(callback).limit(limit);
}

// Fetch single event
module.exports.getUserByUsername = function(username, callback)    {
    var query = {username: username};
    User.find(query, callback);
}

// Register Students
module.exports.registerStudent = function(newUser, newStudent, callback) {
    bcrypt.hash(newUser.password, 15, function(err, hash)    {
        if(err) throw err;
        newUser.password = hash;
        console.log('Student is regiestered');
        async.parallel([newUser.save, newStudent.save], callback);
    });
}

// Register Faculty
module.exports.registerFaculty = function(newUser, newFaculty, callback) {
    bcrypt.hash(newUser.password, 15, function(err, hash)    {
        if(err) throw err;
        newUser.password = hash;
        console.log('Faculty is regiestered');
        async.parallel([newFaculty.save, newStudent.save], callback);
    });
}






Student.js
const mongoose = require('mongoose');

const studentSchema = mongoose.Schema({
    firstName:  {
        type: String,
        required: true
    },
    LastName:    {
        type: String,
        required: true
    },
    userName:  {
        type: String,
        required: true
    },
    email:   {
        type: String,
        required: true
    },
    events: [{
        eventId:    {type: [mongoose.Schema.Types.ObjectId]},
        eventTitle:  {type: String}
    }]
});

var Student = module.exports = mongoose.model('Student', studentSchema);

// Fetch events
module.exports.getStudent = function(callback, limit)   {
    Student.find(callback).limit(limit);
}

// Fetch single event
module.exports.getStudentByUsername = function(username, callback)    {
    var query = {username: username};
    Student.find(query, callback);
}








Faculty.js
const mongoose = require('mongoose');

const facultySchema = mongoose.Schema({
    firstName:  {
        type: String,
        required: true
    },
    LastName:    {
        type: String,
        required: true
    },
    userName:  {
        type: String,
        required: true
    },
    email:   {
        type: String,
        required: true
    },
    events: [{
        eventId:    {type: [mongoose.Schema.Types.ObjectId]},
        eventTitle:  {type: String}
    }]
});

var Faculty = module.exports = mongoose.model('Faculty', facultySchema);

// Fetch events
module.exports.getFaculty = function(callback, limit)   {
    User.find(callback).limit(limit);
}

// Fetch single event
module.exports.getFacultyByUsername = function(username, callback)    {
    var query = {username: username};
    User.find(query, callback);
}







signup.handlebars
<div class="container">
<h4 class="center">New User Registration</h4>

<form action="/users/signup" method="post">
    <input type="hidden" value="student" id="type">
<div class="row">
    <div class="input-field col s6">
    <input id="firstName" type="text" class="validate" name="firstName" value="{{firstName}}">
    <label for="firstName">First Name</label>
    </div>
    <div class="input-field col s6">
    <input id="lastName" type="text" class="validate" name="lastName" value="{{lastName}}">
    <label for="lastName">Last Name</label>
    </div>
</div>
<div class="row">
    <div class="input-field col s6">
    <input id="email" type="email" class="validate" name="email" value="{{email}}">
    <label for="email">Email</label>
    </div>
    <div class="input-field col s6">
    <input id="ernumber" type="text" class="validate" name="ernumber" value="{{ernumber}}">
    <label for="ernumber">Enrollment Number</label>
    </div>
</div>
<div class="row">
    <div class="input-field col s6">
    <input id="password" type="password" class="validate" name="password">
    <label for="password">Password</label>
    </div>
    <div class="input-field col s6">
    <input id="repassword" type="password" class="validate" name="repassword">
    <label for="repassword">Retype Password</label>
    </div>
</div>
<div class="row center-align">
    <button type="submit" class="btn btn-large green waves-effect waves-light">Register</button>
    <button type="reset" class="btn btn-large btn-flat">Reset</button>
</div>
</form>

</div>