app.js

const mongoose = require('mongoose');
const Customer = require('./models/customer') //Import model

//to get rid of mongo warning
mongoose.Promise = global.Promise;

//connect to db
const db = mongoose.connect('mongodb://localhost:27017/testcli', {useMongoClient:true}, { useNewUrlParser: true }); 

//add customer
const addcustomer = (customer) => {
    Customer.create(customer).then(customer => {
        console.info('New Customer Added');
        db.close(); //if we don't close the db it will hang
    })
}


//find customer
const findcustomer = (name) => {
    //make case insensitive
    const search = new RegExp(name, 'i');
    Customer.find({$or: [{firstname: search}, {lastname: search}]})
    .then(customer => {
        console.info(customer);
        console.info(`${customer.length} matches`);;
        db.close();
    });
}


//export the methods
module.exports = {
    addcustomer,
    findcustomer
}

//cli is not in use for now