prakhar3agrwal / uber

Notes: https://drive.google.com/file/d/1XPZEpmeN_m_5yCbAe3st-ECKEg9-r88g/view?usp=sharing

Notes: https://drive.google.com/file/d/1WsrfjzPwtE1d-z94SeVRdOscReeliPQN/view?usp=sharing

Project Setup

• Create project here Spring Boot Starter
• Dependencies
  • all dev (lombok, dev, config)
  • web mvc
  • data-rest
  • jpa (lombok)
  • postgresql driver
  • spring security
  • spring sessions
• download the zip, open in your editor
• setup DB config in uber/src/main/resources/application.properties

DB Setup for Local Dev

Enter the postgres shell: sudo -u postgres psql List users (in psql) \l List databases (in psql) \du Quit the psql shell \q

Create a new DB (in psql) CREATE DATABASE uber; Delete a new DB (in psql) DROP DATABASE uber;

Create a new user with password and db create-write and superuser permissions (shell): sudo -u postgres createuser -d -l -s -P uberadmin Delete user (shell) sudo -u postgres dropuser username

Other Notes

class Driver:
    @OneToOne
	account: Account   # in the driver table, create a col account_id

    @OneToMany
	bookings: [Booking]  # bookings table, driver_id
    # Rohan.bookings()
    # GET * from Booking
    # where user_id = RohanId

class Passenger:
    account: Account
    bookings: [Booking]

class Account:
	# can be for a driver
    # can be for a passenger

class Booking:
    @ManyToOne
    driver: Driver
    passenger: Passenger

Driver 1 - * Booking Passenger 1 - * Booking Driver 1 - 1 Account Passenger 1 - 1 Account

Python - SQLAlchemy ORM - forces you to define relations both ways Django ORM - allows you to define one way relations

ORM is just an abstractions DBs are truth tables with constraints

every row in a table denotes a truth