Migrations

Migrations1 of 10To Create a Blank Migration: rails g migration name To Add Columns: rails g migration Add Anything To TableName [columnName:type]To Remove Columns: rails g migration Remove Anything From TableName [columnName:type]Column tion Methods* value 30falsetrue:emailtruecreate tabledrop tablechange columnremove columnremove indexchange tableadd columnrename columnadd indexActive Record Supported Types:primary :decimal:timestamp:date:boolean* See documentation for syntaxRemove ColumnAdd Columnrails g migration RemoveAgeFromZombies age:integerrails g migration AddEmailToZombies email:stringclass RemoveAgeFromZombies ActiveRecord::Migrationdef upremove column :zombies, :ageenddef downadd column :zombies, :age, :integerendendclass AddEmailToZombies ActiveRecord::Migrationdef upadd column :zombies, :email, :stringenddef downremove column :zombies, :emailendendCreate Tablerails g migration CreateZombiesTable name:string, bio:text, age:integerclass CreateZombiesTable ActiveRecord::Migrationdef upcreate table :zombies do t t.string :namet.text :biot.integer :aget.timestampsendendDon’t Forget to Rake! rake db:migrateRun all missing migrations rake db:rollbackRollback the previous migration rake db:setupCreate db, load schema & seed rake db:schema:dumpDump the current db statedb/schema.rbdef downdrop table org/migrations.html

Rails Command LineCommandShortcut2 of 10Descriptionrails new app name # creates a new Rails applicationrails serverrails s# starts up the Rails serverrails generaterails g# generates template coderails consolerails c# starts up the Rails consolerails dbconsolerails db# starts up the Rails db consoleHelp:All commands can be run with -hfor more informationGenerate Examplesrails g scaffold zombie name:string bio:text age:integerrails g migration RemoveEmailFromUser email:stringrails g mailer ZombieMailer decomp change lost brainModelsNamed ScopeExamplesclass Zombie ActiveRecord::Basescope :rotting, where(rotting: true)scope :fresh, where(“age 20”)scope :recent, order(“created at desc”).limit(3)endCallbacksbefore validationbefore savebefore createbefore updatebefore ie.rotting.recentExamplesafter validationafter saveafter createafter updateafter destroyafter create :send welcome emailbefore save :encrypt passwordbefore destroy :set deleted flagafter update { zombie logger.info “Zombie #{zombie.id} updated” }Self ScopeReading attributes does not require “self ” but settingattributes does require “self ”class Zombie ActiveRecord::Basebefore save :make rottingdef make rottingif age 20self.rotting trueendendendRelationship Optionsdependent: :destroyforeign key: :undead idprimary key: :zidvalidate: trueRelational Includes Examples*@zombies Zombie.includes(:brain).all@recent Zombie.recent.includes(:brain)* To avoid extra queries

REST & RoutesRake Routes3 of 10Generates rake routeszombies- Prints your RESTful routesnew zombieedit zombiezombieGET /zombiesPOST /zombiesGET /zombies/newGET /zombies/:id/editGET /zombies/:idPUT /zombies/:idDELETE /zombies/:idExample Link To Usage % % % % % % link tolink tolink tolink tolink tolink to'All Zombies', zombies path % 'New Zombie', new zombie path % 'Edit Zombie', edit zombie path(@zombie) % 'Show Zombie', zombie path(@zombie) % 'Show Zombie', @zombie % 'Delete Zombie', @zombie, method :delete % {:action ”index”, :controller ”zombies”}{:action ”create”, :controller ”zombies”}{:action ”new”, :controller ”zombies”}{:action ”edit”, :controller ”zombies”}{:action ”show”, :controller ”zombies”}{:action ”update”, :controller ”zombies”}{:action ”destroy”, :controller ”zombies”}Relative Pathszombies pathnew zombie pathAbsolute Pathszombies urlnew zombie urlPath Generated/zombies/zombies/newURL host:3000/zombies/newFormsExample % form for(@zombie) do f % % f.text field :name % % f.text area :bio % % f.select :decomp, ['fresh', 'rotting', 'stale'] % % f.select :decomp, [['fresh', 1], ['rotting', 2], ['stale', 3]] % % f.radio button :decomp, 'fresh', checked: true % % f.radio button :decomp, 'rotting' % % f.radio button :decomp, 'stale' % % f.check box :rotting % % f.submit % % end % Alternate Text Input Helpers % % % % % % f.password field :password % f.number field :price % f.range field :quantity % f.email field :email % f.url field :website % f.telephone field :mobile %

Nested ts controller.rb4 of 10TwitterForZombies::Application.routes.draw doresources :zombies doresources :tweetsendendclass TweetsController ApplicationControllerbefore filter :get zombiedef get zombie@zombie Zombie.find(params[:zombie id])enddef show@tweet ts/2params { :zombie id 4, :id 2 }def create@tweet @zombie.tweets.new(params[:tweet])if @tweet.saveredirect to [@zombie, @tweet]elserender action: “new”enddef index@tweets @zombie.tweetsendend34/zombies/4/tweetsparams { :zombie id 4 }app/views/tweets/ form.html.erb % form for([@zombie, @tweet]) do f % app/views/tweets/index.html.erb % @tweets.each do tweet % tr td % tweet.body % /td td % link to ‘Show’, [@zombie, tweet] % /td td % link to ‘Edit’, edit zombie tweet path(@zombie, tweet) % /td td % link to ‘Destroy’, [@zombie, tweet], method: :delete % /td /tr % end % % link to ‘New Tweet’, new zombie tweet path(@zombie) % Look Up URL Helpers rake routes

View Partials & View Helpers5 of 10app/views/tweets/new.html.erb h1 New tweet /h1 % render 'form' % % link to 'Back', zombie tweets path(@zombie) % app/views/tweets/ form.html.erb h1 New tweet /h1 % render 'form' % % link to 'Back', zombie tweets path(@zombie) % app/views/tweets/edit.html.erb h1 Editing tweet /h1 % render 'form' % - Partials start with an underscoreView Helper div id "tweet % tweet.id % " class "tweet" % tweet.body % /div Same As % div for tweet do % % tweet.body % % end % View Helper % @zombies.each do zombie % % render zombie % % end % Same As % render @zombies % Additional HelpersCallsdom id(@tweet)- #tweet 2Looks Forviews/zombies/ zombie.html.erbResult % truncate("I need brains!", :length 10) % I need bra % truncate("I need brains!", :length 10, :separator ' ') % I need I see % pluralize(Zombie.count, "zombie") % I see 2 zombies / I see 1 zombieHis name was % @zombie.name.titleize % His name was Ash WilliamsAsh’s zombie roles are % @role names.to sentence % Ash’s zombie roles are Captain, and Solidier.He was buried alive % time ago in words @zombie.created at % agoHe was buried alive 2 days agoPrice is % number to currency 13.5 % Price is 13.50Ash is % number to human 13234355423 % years old % Ash is 13.2 billion years old

Creating a Mailer6 of 10Generator: rails g mailer ZombieMailer decomp change lost brainMailer Class Example -app/mailers/zombie mailer.rbclass ZombieMailer ActionMailer::Basedefault from: "from@example.com"def decomp change(zombie)@zombie zombie@last tweet @zombie.tweets.lastattachments['z.pdf'] File.read("#{Rails.root}/public/zombie.pdf")mail to: @zombie.email, subject: 'Your decomp stage has changed'endendMailer Text Views -app/views/zombie mailer/decomp change.text.erbfrom: my@email.comcc: my@email.combcc: my@email.comreply to: my@email.comMass Mailing Notes:Mass mailing is best done outside ofRails. You can use gems for serviceslike MadMimi.com if you plan onsending a lot of nmailer basics.htmlGreetings % @zombie.name % Mailer HTML Views -Additional Optionsapp/views/zombie mailer/decomp change.html.erb h1 Greetings % @zombie.name % /h1 Sending Mail -app/models/zombie.rbZombieMailer.decomp change(@zombie).deliverAssets & Asset PathsAsset Tag Helpers % javascript include tag "custom" % % stylesheet link tag "style" % % image tag "rails.png" % Asset Paths in Stylesheets -app/assets/stylesheets/zombie.css.erbform.new zombie input.submit {background-image: url( % asset path('button.png') % );}Using SASS, CoffeeScript AssetsTo compile with other CSS/JS helpers, just add the necessary coffee-script/

CoffeeScript & jQueryJavaScript & jQueryapp/assets/javascripts/zombie.js (document).ready(function() { ('#show-bio').click(function(event) {event.preventDefault(); (this).hide(); ('.field#bio').show();}}7 of 10CoffeeScript & jQueryapp/assets/javascripts/zombie.js.coffee (document).ready - ('#show-bio').click (event) - event.preventDefault() (this).hide() ('.field#bio').show()CoffeeScript AJAX Example (document).ready - ('div#custom phase2 form').submit (event) - event.preventDefault()url (this).attr('action')custom decomp ('div#custom phase2 #zombie decomp').val() .ajaxtype: 'put'url: urldata: { zombie: { decomp: custom decomp } }dataType: 'json'success: (json) - ('#decomp').text(json.decomp).effect('highlight') ('div#custom phase2').fadeOut() if json.decomp "Dead (again)"SASS & /assets/stylesheets/zombie.css.scss.erbform.new zombie {border: 1px dashed gray;}form.new zombie {border: 1px dashed gray;.field#bio {display: none;}form.new zombie .field#bio {display: none;}input.submit {form.new zombie input.submit {background-image: url( % asset path('button.png') % );}background-image: url( % asset path('button.png') % );}}To Remove SASS/CoffeeScript Default Asset GenerationGemfileRemovegem 'sass-rails'gem 'coffee-script'then rerun 'bundle install'

Sprockets & ion.jsContains a manifest of the JavaScript files we use// require jquery// require jquery ujsLooks for jquery.js in all asset paths// require sharedLoads: lib/assets/javascripts/shared.js.coffee// require tree .app/assets/stylesheet/application.cssContains a manifest of the stylesheets we use/** require reset* require self* require tree .*/Styles in this file are included after the reset stylesheetform.new zombie {border: 1px dashed gray;}Rendering / HTTP Status CodesResponds to Exampleapp/controllers/zombies controller.rbclass ZombiesController ApplicationControllerdef show@zombie Zombie.find(params[:id])respond to do format format.html doif @zombie.decomp 'Dead (again)'render :dead againendendformat.json { render json: @zombie }endendendHTTP Status Codes200 :ok201 :created422 :unprocessed entityRenders app/views/zombies/dead again.html.erbRenders app/views/zombies/show.html.erbRenders JSONJSON Rendering Examples401 :unauthorized102 :processing404 :not foundrender json: @zombie.errors, status: :unprocessable entityrender json: @zombie, status: :created, location: @zombie8 of 10

Custom RoutesTypes:member9 of 10RouteURLget :decomp, on: :member/zombies/:id/decompput :decay, on: :member/zombies/:id/decayget :fresh, on: :collection/zombies/freshpost :search, on: :collection/zombies/searchacts on a single resource:collectionacts on a collection of resourcesExamples % % % % link to 'Fresh zombies', fresh zombies path % form tag(search zombies path) do f % link to 'Get decomp', decomp zombie path(@zombie) % form for @zombie, url: decay zombie path(@zombie) % Custom JSON ResponsesExamples@zombie.to json(only: :name)@zombie.to json(except: [:created at, :updated at, :id, :email, :bio]){ “name” : “Eric” }{ "age":25, "decomp":"Fresh", "name":"Eric", "rotting":false }@zombie.to json(only: [:name, :age])@zombie.to json(include: :brain, except: [:created at, :updated at, :id]){ “name” : “Eric”, "age": 25 }{"age":25,"bio":"I am ,"name":"Eric","rotting":false,"brain": { "flavor":"Butter", "status":"Smashed", "zombie id":3 }}

AJAX110 of 10Make a Remote Link or Form Call % link to 'delete', zombie, method: :delete, remote: true % a href "/zombies/5" data-method "delete" data-remote "true" rel "nofollow" delete /a % form for (@zombie, remote: true) do f % form action "/zombies" data-remote "true" method "post" 2Ensure the Controller Can Accept JavaScript Calls3Write the JavaScript to Return to the Clientrespond to do format format.jsendapp/views/zombies/ action name .js.erb ('# % dom id(@zombie) % ').fadeOut();Other jQuery Actions (' selector ').append( content or jQuery object ); (' selector ').effect('highlight'); (' selector ').text( string );Requires jQuery UI

rails dbconsole rails db # starts up the Rails db console Command Shortcut Description Help: All commands can be run with -h for more information rails g scaffold zombie name:string bio:text age:integer rails g migration RemoveEmailFromUser email:string rails g mailer Zombi