Intro to Rails from Sinatra Notes - Stujo

README.md

Rails vs Sinatra

• Always Read the Rails Guides for Overviews
  • http://guides.rubyonrails.org/
• Search for solutions on google
• Really only read the API Docs if things get really gnarly
  • http://api.rubyonrails.org/

Creating a new Rails Application

$ rails new --help

Note To (Instructor/Self): Remove ~/.railsrc before Demo

$ cat ~/.railsrc
-d=postgresql
-T
-B
--skip-spring

Note: Overview of creating a new rails application, point out comparisions to sinatra as you go

• (http://guides.rubyonrails.org/getting_started.html)[http://guides.rubyonrails.org/getting_started.html]
• rails command line
• rails new options

$ rails new blog -d foo

• databases - prefer postgresql

$ rails new blog -d postgresql -T

Walkthrough Generated Files

$ cd blog
$ tree -d

• Lots of stuff!
• Find correct version: (http://guides.rubyonrails.org/)[http://guides.rubyonrails.org/]

Starting a Rails Application

$ rails s

OOPS :) We need to do a little more

Initializing the Database

$ cat Rakefile
$ rake -T

$ rake db:create

$ rails s
$ open http://localhost:3000/

• TADA! - (Hopefully)

Building Your Application

Pro Tip: Rails Console

$ rails c

Controllers

• rails g controller articles index
• But that generates some things we don't want....
• rails g controller articles index --no-helper --no-assets
• redirect_to instead of Sinatra's redirect

Views

• ERB the same as we did in Sinatra.
• What is Implicit Render?
• View Helpers link_to, form_for

Routing

• $ cat config/routes.rb
• $ rake routes
• _path and _url helpers used in views and redirects

$ rails c
> app.pizzas_url
 => "http://www.example.com/pizzas" 
> app.edit_pizza_url(1)
 => "http://www.example.com/pizzas/1/edit" 

Models

• $ rails generate model Article title body:text
• $ rake db:migrate
• $ rails console (or rails c)
• $ rails db - can fire up psql
• > Article.create!(:title => 'Hello World', :body => 'The answer is 42')

Tie it All Together with resources

• resources :articles

$ rails s
$ open http://localhost:3000/articles/index

And Go Do It!

• Review Routing Docs - http://guides.rubyonrails.org/routing.html
• View Helpers link_to, form_for
• Review views / layouts
• Add CSS in the assets folder *
• RSpec
  • https://github.com/rspec/rspec-rails
• What is scaffolding?
  • rails g scaffold pizzas