Intro to Rails

Intro to Rails Sebastián Sogamoso @sebasoga

Intro to Rails What is Rails?

Intro to Rails Rails is a framework for creating web
applications in Ruby

Intro to Rails What is a web page?

Intro to Rails

Intro to Rails https://railsgirls.com/bogota

Intro to Rails https://railsgirls.com/bogota Request

Intro to Rails https://railsgirls.com/bogota Find file: cities/bogota.html

Intro to Rails https://railsgirls.com/bogota <html lang=“eng”> <head> <meta charset=“utf-8”>…

Intro to Rails https://railsgirls.com/bogota <html lang=“eng”> <head> <meta charset=“utf-8”>… Response

Intro to Rails What is a web application?

Intro to Rails

Intro to Rails https://www.facebook.com/railsgirls <html lang=“eng”> <head> <meta charset=“utf-8”>… Response
Request

Intro to Rails m/railsgirls charset=“utf-8”>… • Get list of fans
• Get list of comments • Order the comments by date • Get group photos • …

Intro to Rails What is Rails?

Intro to Rails Rails is a framework for creating web
applications in Ruby

Intro to Rails How does Rails do that?

Intro to Rails By following the this ideas: • MVC
pattern • Convention over configuration

Intro to Rails MVC Pattern Model View Controller

Intro to Rails Model

Intro to Rails This class (model) represents a table in
the database called “carts”

Intro to Rails This class (model) represents a table in
the database called “carts” Convention over configuration

Intro to Rails Rails includes an ORM called ActiveRecord

Intro to Rails Associations with other models

Intro to Rails Validations of its own state

Intro to Rails “Business logic”

Intro to Rails Controller

Intro to Rails Methods are called actions

Intro to Rails Methods use models to access the database

Intro to Rails Methods set instance variables

Intro to Rails Can explicitly render or redirect

Intro to Rails Can access the request parameters as a
hash

Intro to Rails View

Intro to Rails Uses ERB, Rails default templating language

Intro to Rails Regular HTML

Intro to Rails Special tags to execute Ruby

Intro to Rails Access to the instance variables set in
the controller

Intro to Rails How do they work together?

Intro to Rails http://my-rails-app.com <html lang=“eng”> <head> <meta charset=“utf-8”>… Response
Request

Intro to Rails Model View Controller

Intro to Rails Model View Controller Router

Intro to Rails How do I get started?

Intro to Rails $ gem install rails

Intro to Rails $ gem install rails Just the name
for Ruby libraries

Intro to Rails

Intro to Rails Rails is modular, made out of other
18 libraries

Intro to Rails $ rails new my_app

Intro to Rails $ rails new my_app The name of
your Rails app

Intro to Rails

Intro to Rails Creates a bunch of files and then
install the dependencies

Intro to Rails

Intro to Rails File with the list of libraries (gems)
you want to use

Intro to Rails Where app configuration files are

Intro to Rails Where database schema and migrations are

Intro to Rails Where tests go

Intro to Rails Where your application code is $ cd
app/

Intro to Rails

Intro to Rails Where CSS, JS and images go

Intro to Rails Where controllers go

Intro to Rails Helpers are “globally scoped” methods intended to
be used mainly in views and controllers

Intro to Rails Classes that make sending email easy

Intro to Rails Where models go

Intro to Rails Where views go

Let’s see this in action! @sebasoga

Intro to Rails

Intro to Rails

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