Introduction to Rails
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Here are the changes to make: 1. In app/views/people/index.html.erb, change "Listing people" to "My Class List" 2. Update the each loop to display first initial and last name: <% @people.each do |person| %> <td><%= person.first_name[0] %>. <%= person.last_name %></td> <% end %>
Introduction to Rails
- 1. RUBY ON RAILS AN INTRODUCTION TO RAILS 3
- 2. CREATING YOUR FIRST RAILS APP rails new roster This command generates code for a new Rails web application in a sub-directory called “roster”
- 3. THE APPLICATION DIRECTORY • The whole rails app is in this one directory • No hidden configuration files in system directories • You will modify many of these files in the course of your development • We're using sqlite so even the database is in this directory, but usually the database is the only part of your application that lives somewhere else • You can simple copy this directory to server to deploy the app • You can delete the directory and its contents if you want to throw it away and start over
- 4. RUNNING YOUR APP cd roster bundle rails server
- 5. RAILS ENVIRONMENTS By default, Rails is configured with 3 environments: • development • test • production
- 8. RAILS ENVIRONMENTS The environment can be specified with RAILS_ENV as an environment variable "development" by default. In your code, you refer to Rails.env (or RAILS_ENV in Rails 2)
- 10. ADDITIONAL CONFIGURATION config/environments/ • development.rb • production.rb • test.rb
- 11. MODIFYING THE HOME PAGE public/index.html All files in the public directory are static content. Rails checks this directory before executing any dynamic code.
- 12. MVC
- 13. LEARNING WITH SCAFFOLD rails generate scaffold person first_name:string last_name:string
- 15. SCAFFOLD Model app/models/person.rb db/migrate/20090611073227_create_people.rb 5 views app/views/people/index.html.erb app/views/people/show.html.erb app/views/people/new.html.erb app/views/people/edit.html.erb app/views/people/_form.html.erb Controller app/controllers/people_controller.rb route.rb: resources :people
- 16. MVC Model: ActiveRecord • Represents what is in the database View: ActionView, erb • Model rendered as HTML Controller: ActionController • Receives HTTP actions (GET, POST, PUT, DELETE) • Decides what to do, typically rendering a view
- 17. VIEWS <% @people.each do |person| %> <tr> <td><%= person.first_name %></td> <td><%= person.last_name %></td> </tr> <% end %>
- 18. VIEW EXERCISE On the main people page a. Change “Listing people” to “My Class List” b. List people with first initial and last name in one visual column (e.g. W. Flintstone)