Getting Started with Rails 2.0 Scaffold
Rails
2.0 changes the way Scaffold
works. This blog walks you through the steps to create a simple CRUD
application using Scaffold in Rails 2.0.
You can also deploy this application easily on GlassFish v3 gem. Just follow the instructions here and enjoy!
I'll post a follow up blog where this is much more simplifed using NetBeans 6.1 builds where JRuby 1.1 and Rails 2.0.2 are already integrated.
Published at DZone with permission of its author, Arun Gupta. (source)- Download & Install JRuby 1.1 RC2.
- Install Rails using the following command:
jruby -S gem install rails - Create a new Rails app using the following command:
cd samples; mkdir rails; cd rails
jruby -S rails books -d mysql - Start MySQL server in a different shell using the following
command:
sudo /usr/local/mysql/bin/mysqld_safe --console - Creat the database using the following command:
cd books
jruby -S rake db:create
This creates the database defined by RAILS_ENV (Development is default). Here are some other new database-related commands:
db:create:allCreate all the databases (_Development, _Test, _Production) db:dropDrops your database db:resetDrop and Re-create your database, including migrations - Generate a scaffold using the following command:
jruby script/generate scaffold book title:string author:string isbn:string description:text
The output of the command looks like:exists app/models/
exists app/controllers/
exists app/helpers/
create app/views/books
exists app/views/layouts/
exists test/functional/
exists test/unit/
create app/views/books/index.html.erb
create app/views/books/show.html.erb
create app/views/books/new.html.erb
create app/views/books/edit.html.erb
create app/views/layouts/books.html.erb
create public/stylesheets/scaffold.css
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
create app/models/book.rb
create test/unit/book_test.rb
create test/fixtures/books.yml
create db/migrate
create db/migrate/001_create_books.rb
create app/controllers/books_controller.rb
create test/functional/books_controller_test.rb
create app/helpers/books_helper.rb
route map.resources :books
There is no need to create the model explicitly as was the case in previous version of Rails. This creates the "db/migrate/001_create_books.rb" migration which looks likeclass CreateBooks < ActiveRecord::Migration
def self.up
create_table :books do |t|
t.string :title
t.string :author
t.string :isbn
t.text :description
t.timestamps
end
end
def self.down
drop_table :books
end
end - Create the database tables using the following command:
jruby -S rake db:migrate - Deploy the application on WEBrick using the following
command:
jruby script/server
The application is now available at "http://localhost:3000/books" and looks like:
- Click on "New book" to see a page as shown below (with
values entered):
Click on Create button. After 2 entries have been entered, it looks like as shown below:
You can also deploy this application easily on GlassFish v3 gem. Just follow the instructions here and enjoy!
I'll post a follow up blog where this is much more simplifed using NetBeans 6.1 builds where JRuby 1.1 and Rails 2.0.2 are already integrated.
