Customer.js

const mongoose = require('mongoose');
const User = require('./user');

const CustomerSchema = new mongoose.Schema({
    user: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
    },
    name: {
        type: String,
        default: '',
    },
    contact: {
        type: String,
        default: 'No contact name found',
    },
    email: {
        type: String,
        default: 'No email addresses found',
    },
});

module.exports = mongoose.model('Customer', CustomerSchema);