Git/Github

• Unless you are experienced, I recommend avoiding creating branches
• At the start it’s easy to get into trouble
• These are commands you should be very familiar with
  1. git init
  2. git clone
  3. git commit
  4. git add
  5. git status
  6. git push
  7. git pull
• See Git and GitHub

What a web server does

• Reductionist view
• Client sends url, server returns html

• Review of some basic concepts
  1. Client and Server
  2. Client asks for a page; server sends a page
  3. Web server receives the request and creates the page and sends it back
• A level deeper:
  1. Server (usually) looks inside a database for information
  2. And runs an algorithm on that to create the output
  3. And that’s what gets sent back.

• Review of Internet Networking
• Review of design and operation of: World Wide Web

HTTP

• HTTP verbs
  1. GET - get representation of resource at URI
  2. PUT - replace representation of resource at URI
  3. POST - Add a new resource
  4. others
• HTTP - Hypertext Transfer Protocol

URI Routes and routing

• Components of a URI http://cs.brandeis.edu:3000/accounting/homepage?format=summary
  • protocol - http://
  • hostname - cs.brandeis.edu
  • optional port number - :3000
  • path: /accounting/homepage
  • optional query string: ?format=summary
• Routing: Web Server parses the URI and calls the appropriate code to handle it
• See URI - Uniform Resource Identifier

Relational Database

• Tables
• Rows
• Primary keys
• Foreign keys
• Postgres
• Review: ActiveRecord Mechanics

Deploying application to Heroku

Models, Views, Controllers

• Core concept from 166: Models
• Ruby language: syntax, gems, bundler
• Ruby Example: Basics
• Ruby Examples of Classes
• Ruby Example: Inheritance
• Things to remember about Ruby
• Testing with Minitest/Spec

Live coding

• Sinatra intro practice: Hands On Sinatra Intro
• Or, Ruby intro practice Simple car game

Thank you. Questions?  (random Image from picsum.photos)