startup

• rails new appName
• bundle install install gems
• rails server start server

request/response cycle

a controller, a route, and a view

• When you type http://localhost:8000/welcome, the browser makes a request for the URL /welcome.
• The request hits the Rails router.
• The router maps the URL to a controller action to handle the request.
• The controller action recieves the request, and asks the model to fetch data from the database.
• The model returns data to the controller action.
• The controller action passes the data on to the view.
• The view renders the page as HTML.
• The controller sends the HTML back to the browser.

controller

rails generate controller Pages create file app/controllers/pages_controller.rb.

add function

class PagesController < ApplicationController def home end end

router

config/routes.rb get 'welcome' => 'pages#home'

when a user visits http://localhost:8000/welcome, the route will tell Rails to send this request to the Pages controller's home action

view

html app/views/pages/home.html.erb

css app/assets/stylesheets/pages.css.scss