jwashke

What users want	CRUD	Action(URL)	Method/Verb	Data prep/manipulation	Redirect/Render	View
See all tasks	read	'/tasks'	GET	@tasks = task_manager.all	render	:index
See one task	read	'/tasks/:id'	GET	@task = task_manager.find(id)	render	:show
See form to put new task into	create	'/tasks/new'	GET	none	render	:new
Submit form to create new task	create	'/tasks'	POST	task_manager.create(params[:task])	redirect to '/tasks'
See a form to edit task info	upda

jwashke

How the Web Works

What happens when you enter a url into the address bar of a web browser and hit enter

• This is a common interview question

Hypertext Transfer Protocol (HTTP)

Stores no state, simple text documents transferred back and forth.

HTTP Verbs

• GET - Retrieve information identified by the Request-URI
  • GET /users => All users
• POST - Create a new resource identified by the Request-URI

jwashke

Sinatra

• Ruby gem
• Domain-specific language (DSL)
• minimal effort Ruby library that makes HTTP access and simple web apps easy
• Much more light weight than rails so more suitable for smaller simpler applications.

Things about Sinatra

• modular vs classic style
• Rack-compatible

jwashke

Introduction to Sinatra

1. What is the purpose of the server file (routing)?

The server file serves as the main point of contact between the client and the server. The server file takes in the http request from the client and routes the client to the proper page base on the verb and the path of the http request.

2. How do you pass variables into the views?

Instance variables are useable in the view when it is rendered. local variables you pass in using a key value hash erb(:index, locals => { :name_in_view => name_in_server }

3. How can we interpolate ruby into a view (html)?

Using ERB (Embedded RuBy) in the server call the erb method and tell it the view you want it to render.