Your first rails app - 2
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The document provides an overview of creating and running a basic Rails application. It discusses generating a new Rails app called "roster" and the directory structure it creates. It describes the development, test, and production environments in Rails and additional configuration files. It also introduces the model-view-controller (MVC) pattern used in Rails applications and using scaffolds to quickly generate models, views, and controllers.
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Your first rails app - 2
- 1. YOUR FIRST RAILS APP Environments, MVC, Scaffold Sunday, November 13, 11
- 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” Sunday, November 13, 11
- 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 Sunday, November 13, 11
- 4. RUNNING YOUR APP cd roster bundle rails server Sunday, November 13, 11
- 5. RAILS ENVIRONMENTS By default, Rails is configured with 3 environments: • development • test • production Sunday, November 13, 11
- 6. RAILS ENVIRONMENTS Sunday, November 13, 11
- 7. RAILS ENVIRONMENTS Sunday, November 13, 11
- 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) Sunday, November 13, 11
- 10. ADDITIONAL CONFIGURATION config/environments/ • development.rb • production.rb • test.rb Sunday, November 13, 11
- 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. Sunday, November 13, 11
- 12. MVC Sunday, November 13, 11
- 13. LEARNING WITH SCAFFOLD rails generate scaffold person first_name:string last_name:string Sunday, November 13, 11
- 14. NAMING CONVENTIONS Sunday, November 13, 11
- 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 Sunday, November 13, 11
- 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 Sunday, November 13, 11
- 17. VIEWS <% @people.each do |person| %> <tr> <td><%= person.first_name %></td> <td><%= person.last_name %></td> </tr> <% end %> Sunday, November 13, 11
- 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) Sunday, November 13, 11