notes.txt

1) create package.json   $ npm init
2) install dependences:
    npm install --save express
    npm install --save-dev nodemon  # live changes server
3) create express app, and routes initial
4) install mongodb server >>> https://tecadmin.net/install-mongodb-on-ubuntu/
    start mongod: sudo systemctl start mongod  sudo systemctl stop mongod 
    create and chmod /data/db

5) mongodb in project: $ npm install --save mongoose
  add connection in index.js app

6) create models/ schemas - clients created
7) create controller like clients
    add in /index.js 
     // eneable bodyparser
    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: true }));
8) use clientsController in routes and test paths with postman
9) products controller, model and routes created
10) add shortid and multer for upload images
     npm install --save shortid multer  # shortid is for image names
11) add orders controller
    ## send new order
    {
      "client": "5d5d6c9b177c8b391afcdfd6",
      "products": [
        {
          "product": "5d5d9bd622a10b5b6968de2b",
          "qty": 2
        },
        {
          "product": "5d5db7ddbb7b4e73efc63e21",
          "qty": 1
        }
      ],
      "amount": "50.0"
    }
12) eneable CORS
    npm install --save cors
    eneable in index.js
13) sweet alert
     npm install --save sweetalert2

14) eneable public folder in index.js
  // public folder
  app.use(express.static('uploads'));

15)