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THE SUPER DUPER BASICS OF RAILS TOMMY PALMER @tommypalm

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A bit of backstory...

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I’m Tommy

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EX-IMDER

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Interactive Multimedia Design

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Design

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HTML, CSS + Wordpress

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Aren’t you a developer?

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HELL YEAH I AM!

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What happened?

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Ruby on Rails is optimised for programmer happiness and productivity.

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STUFF THAT I WISH I KNEW ABOUT RAILS TWO YEARS AGO & WHY I WANTED TO LEARN IT

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Ruby is easy to read

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Easier than this

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question = "Isn't Ruby great?" question = question.upcase puts question => "ISN'T RUBY GREAT?"

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The Belfast Ruby Scale

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The Belfast Ruby Scale

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Ruby is a language Rails is a framework

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Rails lets you do common web app things • working with databases • rendering HTML • sending email • and more...

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Rails comes packaged as a gem

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EH?

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Gems give extra functionality to Ruby: • working with apis • tools for blogging • stylesheets (sass)

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Rails is a framework for rapid web development

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ActiveRecord is for databases

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ActionView renders our HTML

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ActionMailer deals with emails

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ActionPack deals with HTTP requests & responses

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ActionModel deals with our data

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ActionResource deals with HTTP actions (GET, PUT, POST, DELETE)

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ActiveSupport extends Ruby with lots of helpful bits

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Railties brings them all together

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We also get the rails command

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Generates a blank Rails app rails new ourcoolapp

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Starts a local server rails server

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No MAMP! Yay!

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Starts our Rails app in the Terminal and interacts with it rails console

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Before we continue

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Does not generate a blog rails new blog

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Does not generate Twitter rails new twitter

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Does not generate Basecamp rails new basecamp

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This message brought to you by @shylands

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DESIGNERS! DON’T BE AFRAID OF...

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THE TERMINAL It’s not that bad

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The Terminal is where you are in your filesystem

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Moving into your Rails app let’s us do the command line stuff cd ourcoolapp

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A blank Rails app

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/app is where most of our work happens

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NOW FOR THE JUICY BITS!

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Rails is an MVC framework

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/models - Models /views - Views /controllers - Controllers

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Models are our data types posts, users, photos, etc

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Views are the HTML (with some Ruby magic)

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Controllers link the Models and Views

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routes.rb is our URLs

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Views have the extension .html.erb

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ERB stands for Embedded Ruby

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<% @posts.each do |post| %>

<%= post.title %>

<%= post.body %>

<%= post.pub_date %>

<% end %>

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Inside <% %> is evaluated Ruby code

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Inside <%= %> is output to the HTML

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Controllers process traffic and fill the ruby code

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/posts/1 show.html.erb Post with ID 1 def show @post = Post.find(params[:id]) end

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Model View Controller routes.rb Browser

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Model View Controller routes.rb Browser

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Model View Controller routes.rb Browser

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Model View Controller routes.rb Browser Database

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Model View Controller routes.rb Browser Database

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Model View Controller routes.rb Browser Database

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Model View Controller routes.rb Browser Database

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Model View Controller routes.rb Browser Database

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This generates our Model, Views, Controller and some other stuff... rails g scaffold post title:string body:text pub_date:date

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...including Migrations!

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Migrations are great!

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Migrations let us incrementally update our database

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class CreatePosts < ActiveRecord::Migration def change create_table :posts do |t| t.string :title t.text :body t.date :pub_date t.timestamps end end end

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Migrates the database rake db:migrate

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rake db:migrate # Migrate the database (options: VERSION=x, VERBOSE=false). rake db:migrate:status # Display status of migrations rake db:rollback # Rolls the schema back to the previous version (specify steps w/ STEP=n). rake db:schema:dump # Create a db/schema.rb file that can be portably used against any DB supported by AR rake db:schema:load # Load a schema.rb file into the database rake db:seed # Load the seed data from db/seeds.rb rake db:setup # Create the database, load the schema, and initialize with the seed data More rake commands

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Rails knows plurals of lots of objects (through ActiveSupport)

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post - posts user - users octopus - octopi sheep - sheep

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Model - post.rb Controller - posts_controller.rb Views - show, index, new & edit.html.erb Migration - (unix timestamp)_create_posts.rb routes.rb - resources :posts rails g scaffold post

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Scaffolds let us prototype quickly

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rails g scaffold post title:string body:text pub_date:date

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Not so great in the long run

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Generate separately rails g controller users rails g model user rails g migration CreateUsers

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More useful code Less crappy code

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Better use of time Cleaner application

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Rails makes good web development easier

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Being a Rails dev

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New to Rails?

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Used it before?

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Rails is pretty sweet

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thanks! TOMMY PALMER @tommypalm [email protected] [email protected]

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questions to @ belfastruby TOMMY PALMER @tommypalm [email protected] [email protected]