A Z Introduction To Ruby On Rails
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The document discusses an introduction to Ruby on Rails. It provides an overview of Ruby and Rails, demonstrates how to build a sample application using Rails with employers and jobs, and discusses concepts like MVC architecture, scaffolding, associations, and RESTful routing. The sample application allows users to view, create, edit and delete employer and job records along with their associations.
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A Z Introduction To Ruby On Rails
- 1. Hello
- 7. rdempsey
- 9. A-Z Intro To Ruby on Rails
- 12. Teach Others
- 14. Be Bold
- 15. Whatʼs Going On • Introduction to Ruby • Introduction to Rails • Hands-on Lab • Breaks interspersed
- 16. Ruby
- 18. 1995
- 19. 2006
- 20. Perl SmallTalk Eiffel Ada + Lisp Ruby
- 21. #10 baby!
- 23. 5.times { print “We love Ruby” }
- 24. class Numeric def plus(x) self.+(x) end end y = 5.plus 6 # y is now equal to 11
- 26. Rails
- 28. 2005
- 29. Image copyright 2008 Yoshiko314 (Flickr)
- 33. MVC
- 38. map.root :controller => ʻemployersʼ
- 39. Action HTTP Method URL XML index GET /jobs /jobs.xml show GET /jobs/1 /jobs/1.xml new GET /jobs/new edit GET /jobs/1;edit create POST /jobs /jobs.xml update PUT /jobs/1 /jobs/1.xml destroy DELETE /jobs/1 /jobs/1.xml
- 41. The Project • Employers • Jobs
- 42. rails jobby -d postgresql
- 43. rails jobby -d mysql
- 48. app/ controllers/ helpers/ models/ views/
- 59. development: adapter: postgresql encoding: unicode database: jobby_development pool: 5 username: root password: config/database.yml
- 60. development: adapter: mysql encoding: utf8 database: jobby_development pool: 5 username: root password: socket: /tmp/mysql.sock config/database.yml
- 61. rake db:create
- 62. script/server
- 65. map.connect ʻ:controller/:action/:idʼ map.connect ʻ:controller/:action/:id.:formatʼ config/routes.rb
- 67. script/generate scaffold Employer name:string address:string city:string state:string zipcode:string
- 68. exists app/models/ exists app/controllers/ exists app/helpers/ create app/views/employers exists app/views/layouts/ exists test/functional/ exists test/unit/ create test/unit/helpers/ exists public/stylesheets/ create app/views/employers/index.html.erb create app/views/employers/show.html.erb create app/views/employers/new.html.erb create app/views/employers/edit.html.erb create app/views/layouts/employers.html.erb create public/stylesheets/scaffold.css create app/controllers/employers_controller.rb create test/functional/employers_controller_test.rb create app/helpers/employers_helper.rb create test/unit/helpers/employers_helper_test.rb route map.resources :employers dependency model exists app/models/ exists test/unit/ exists test/fixtures/ create app/models/employer.rb create test/unit/employer_test.rb create test/fixtures/employers.yml create db/migrate create db/migrate/20090501175821_create_employers.rb
- 70. class CreateEmployers < ActiveRecord::Migration def self.up create_table :employers do |t| t.string :name t.string :address t.string :city t.string :state t.string :zipcode t.timestamps end end def self.down drop_table :employers end end db/migrations/2009...create_employers.rb
- 71. rake db:migrate
- 72. map.root :controller => ʻemployersʼ config/routes.rb
- 74. class Employer < ActiveRecord::Base end app/models/employer.rb
- 75. class Employer < ActiveRecord::Base validates_presence_of :name validates_length_of :city, :minimum => 3 end app/models/employer.rb
- 79. Model => Logic
- 80. script/console
- 82. # GET /employers # GET /employers.xml def index @employers = Employer.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @employers } end end app/controllers/employers_controller.rb
- 83. # GET /employers # GET /employers.xml def index @employers = Employer.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @employers } end end app/controllers/employers_controller.rb
- 84. # GET /employers # GET /employers.xml def index @employers = Employer.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @employers } end end app/controllers/employers_controller.rb
- 87. <%= link_to 'New employer', ... %> app/views/employers/index.html.erb
- 90. # GET /employers/new # GET /employers/new.xml def new @employer = Employer.new respond_to do |format| format.html # new.html.erb format.xml { render :xml => @employer } end end app/controllers/employers_controller.rb
- 92. # POST /employers # POST /employers.xml def create @employer = Employer.new(params[:employer]) respond_to do |format| if @employer.save flash[:notice] = 'Employer was successfully created.' format.html { redirect_to(@employer) } format.xml { render :xml => @employer, :status => :created, :location => @employer } else format.html { render :action => quot;newquot; } format.xml { render :xml => @employer.errors, :status => :unprocessable_entity } end end end app/controllers/employers_controller.rb
- 93. # GET /employers/1 # GET /employers/1.xml def show @employer = Employer.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @employer } end end app/controllers/employers_controller.rb
- 95. # GET /employers/1/edit def edit @employer = Employer.find(params[:id]) end app/controllers/employers_controller.rb
- 97. # PUT /employers/1 # PUT /employers/1.xml def update @employer = Employer.find(params[:id]) respond_to do |format| if @employer.update_attributes(params[:employer]) flash[:notice] = 'Employer was successfully updated.' format.html { redirect_to(@employer) } format.xml { head :ok } else format.html { render :action => quot;editquot; } format.xml { render :xml => @employer.errors, :status => :unprocessable_entity } end end end app/controllers/employers_controller.rb
- 98. # DELETE /employers/1 # DELETE /employers/1.xml def destroy @employer = Employer.find(params[:id]) @employer.destroy respond_to do |format| format.html { redirect_to(employers_url) } format.xml { head :ok } end end app/controllers/employers_controller.rb
- 100. Partials
- 103. <%= render :partial => 'form' %>
- 106. <%= render :partial => 'shared/form' %>
- 108. before_filter :find_employer, :only => [:show, :edit, :update, :destroy] app/controllers/employers_controller.rb
- 110. private def find_employer @employer = Employer.find(params[:id]) end app/controllers/employers_controller.rb
- 113. class CreateJobs < ActiveRecord::Migration def self.up create_table :jobs do |t| t.integer :employer_id t.string :name t.text :description t.timestamps end end def self.down drop_table :jobs end end db/migrations/2009...create_jobs.rb
- 114. rake db:migrate
- 116. jobs employers Model: Job Model: Employer belongs_to :employer has_many :jobs id integer id integer employer_id integer name string name string address string
- 117. employers jobs Model: Employer Model: Job has_one :job belongs_to :employer id integer id integer name string employer_id integer address string name string
- 118. employers jobs Model: Employer Model: Job has_many :jobs belongs_to :employer id integer id integer name string employer_id integer address string name string
- 119. physicians Model: Physician has_many :appointments has_many :patients, :through => :appointments appointments id integer Model: Appointment name string belongs_to :physician belongs_to :patient id integer patients physician_id integer Model: Patient patient_id integer has_many :appointments has_many :physicians, :through => :appointments id integer name string
- 120. physicians Model: Physician has_and_belongs_to_many :patients id integer physicians_patients name string physician_id integer patients patient_id integer Model: Patient has_and_belongs_to_many :physicians id integer name string
- 121. class Job < ActiveRecord::Base end app/models/job.rb
- 122. class Job < ActiveRecord::Base belongs_to :employer validates_presence_of :name validates_presence_of :description end app/models/job.rb
- 123. class Job < ActiveRecord::Base belongs_to :employer validates_presence_of :name validates_presence_of :description end app/models/job.rb
- 124. class Employer < ActiveRecord::Base has_many :jobs validates_presence_of :name validates_length_of :city, :minimum => 3 end app/models/employer.rb
- 125. map.resources :employers map.resources :employers, :has_many => :jobs map.resources :jobs app/controllers/employers_controller.rb
- 129. private def find_employer @employer = Employer.find(params[:employer_id]) end app/controllers/jobs_controller.rb
- 131. # GET /jobs # GET /jobs.xml def index @jobs = @employer.jobs respond_to do |format| format.html # index.html.erb format.xml { render :xml => @jobs } end end app/controllers/jobs_controller.rb
- 133. # GET /jobs/new # GET /jobs/new.xml def new @job = Job.new @job = @employer.jobs.build respond_to do |format| format.html # new.html.erb format.xml { render :xml => @job } end end app/controllers/jobs_controller.rb
- 136. # POST /jobs # POST /jobs.xml def create @employer = Employer.find(params[:employer_id]) @job = @employer.jobs.build(params[:job]) respond_to do |format| if @job.save flash[:notice] = 'Job was successfully created.' format.html { redirect_to employer_job_url(@employer, @job) } format.xml { render :xml => @job, :status => :created, :location => @job } else format.html { render :action => quot;newquot; } format.xml { render :xml => @job.errors, :status => :unprocessable_entity } end end end app/controllers/jobs_controller.rb
- 137. # GET /jobs/1 # GET /jobs/1.xml def show @job = @employer.jobs.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @job } end end app/controllers/jobs_controller.rb
- 139. # GET /jobs/1/edit def edit @job = @employer.jobs.find(params[:id]) end app/controllers/jobs_controller.rb
- 141. # PUT /jobs/1 # PUT /jobs/1.xml def update @job = Job.find(params[:id]) respond_to do |format| if @job.update_attributes(params[:job]) flash[:notice] = 'Job was successfully updated.' format.html { redirect_to employer_job_url(@employer, @job) } format.xml { head :ok } else format.html { render :action => quot;editquot; } format.xml { render :xml => @job.errors, :status => :unprocessable_entity } end end end app/controllers/jobs_controller.rb
- 142. # DELETE /jobs/1 # DELETE /jobs/1.xml def destroy @job = Job.find(params[:id]) @job.destroy respond_to do |format| format.html { redirect_to employer_jobs_url(@employer) } format.xml { head :ok } end end app/controllers/jobs_controller.rb
- 155. Next Steps
- 156. DRY up our Job views Add search to our jobs Add a logins for employers Add tags to our jobs
- 157. Resources
- 158. Rails Guides Agile Web Development (PP) Intro to Ruby 1.9 Cucumber + RSpec
- 159. Contest!
- 160. Letʼs Chat