Ruby on Rails Notes

Rails related links

• Rails Website
• Rails Documentation
• Rails Guides

Cmd Commands

• rails new [project_name] - Create new Rails Project
• rails s - start localhost server
• bundle - bundle all the gems in the Gemfile
• rails c - open the rails server terminal
• rails generate migration [options]
• rake db:migrate

Important folders

• app
• app > controllers
• app > models
• app > views
• config
• db > migrate

Important files

• Gemfile
• views > layouts > application.html.erb
• config > routes.rb
• db > schema.rb

Useful Ruby Commands

• session
• redirect_to [route_name]_path
• render
• flash

Other

• <% %> tag is for ruby code in the html.erb file
• <%= %> tag is for things that are going to be printed in the browser
• get “/about”, to: “about#index” in the routes.rb file means: When a GET request for the /about dir is received, go to: controllers/about_controller.rb where the “AboutController” class is and a def index function inside. The index function points to: views/about/index.html.erb which is what will be rendered in the browser
• instance variables @variable are visible in the html.erb files of their respective function