The default database for Rails 2.0.x application is SQLite3. This database is bundled with Mac OSX Leopard and so makes it really easy to get started with Ruby-on-Rails. But it requires couple of additional steps if you are using JRuby.

TOTD #28 explains how to create a simple CRUD application using Rails 2.0.x. It uses MySQL database which is strongly recommended for deployment. This TOTD (Tip Of The Day) provides complete steps to run a Ruby-on-Rails application using JRuby and GlassFish Gem with the default database, i.e. SQLite3.

1. Create a Rails application as:

   ~/samples/jruby >~/testbed/jruby-1.1.2/bin/jruby -S rails runner       create        create  app/controllers       create  app/helpers       create  app/models       create  app/views/layouts . . .       create  log/server.log       create  log/production.log       create  log/development.log       create  log/test.log

   The generated “database.yml” looks like:

   # SQLite version 3.x #   gem install sqlite3-ruby (not necessary on OS X Leopard) development:   adapter: sqlite3   database: db/development.sqlite3   timeout: 5000 # Warning: The database defined as “test” will be erased and # re-generated from your development database when you run “rake”. # Do not set this db to the same as development or production. test:   adapter: sqlite3   database: db/test.sqlite3   timeout: 5000 production:   adapter: sqlite3   database: db/production.sqlite3   timeout: 5000

2. SQLite3 adapter is installed for the native Ruby bundled with Leopard. But in order to use SQLite3 with JRuby, you need to install SQLite3 JDBC adapter as shown below:
   

   ~/samples/jruby/runner >~/testbed/jruby-1.1.2/bin/jruby -S gem install activerecord-jdbcsqlite3-adapter JRuby limited openssl loaded. gem install jruby-openssl for full support. http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL Successfully installed activerecord-jdbc-adapter-0.8.2 Successfully installed jdbc-sqlite3-3.5.8 Successfully installed activerecord-jdbcsqlite3-adapter-0.8.2 3 gems installed Installing ri documentation for activerecord-jdbc-adapter-0.8.2… Installing ri documentation for jdbc-sqlite3-3.5.8… Installing ri documentation for activerecord-jdbcsqlite3-adapter-0.8.2… Installing RDoc documentation for activerecord-jdbc-adapter-0.8.2… Installing RDoc documentation for jdbc-sqlite3-3.5.8… Installing RDoc documentation for activerecord-jdbcsqlite3-adapter-0.8.2…

3. Create a new file as “db/development.sqlite3″. It can be easily created using the “touch” command. See the beauty of SQLite that “db:create” is not required
4. Update the development section of “database.yml” such that it looks like:
   

   development:   adapter: jdbcsqlite3   database: db/development.sqlite3   timeout: 5000

5. Create a simple scaffold as shown below:
   

   ~/samples/jruby/runner >~/testbed/jruby-1.1.2/bin/jruby script/generate scaffold run distance:float minutes:integer JRuby limited openssl loaded. gem install jruby-openssl for full support. http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL       exists  app/models/       exists  app/controllers/       exists  app/helpers/       create  app/views/runs       exists  app/views/layouts/       exists  test/functional/       exists  test/unit/       exists  public/stylesheets/       create  app/views/runs/index.html.erb       create  app/views/runs/show.html.erb       create  app/views/runs/new.html.erb       create  app/views/runs/edit.html.erb       create  app/views/layouts/runs.html.erb       create  public/stylesheets/scaffold.css       create  app/controllers/runs_controller.rb       create  test/functional/runs_controller_test.rb       create  app/helpers/runs_helper.rb        route  map.resources :runs   dependency  model       exists    app/models/       exists    test/unit/       exists    test/fixtures/       create    app/models/run.rb       create    test/unit/run_test.rb       create    test/fixtures/runs.yml       create    db/migrate       create    db/migrate/20080630211244_create_runs.rb

   and run the migration as

   ~/samples/jruby/runner >~/testbed/jruby-1.1.2/bin/jruby -S rake db:migrate (in /Users/arungupta/samples/jruby/runner) == 20080630205502 CreateRuns: migrating ======================================= — create_table(:runs) &nbs p;  -> 0.0410s    -> 0 rows == 20080630205502 CreateRuns: migrated (0.0420s) ==============================

6. A Rails application is deployed on GlassFish from it’s parent directory. Therefore the application needs to be updated so taht exact location of database is specified. Basically you need to edit “database.yml” and the updated “development” fragment looks like:
   

   development:   adapter: jdbcsqlite3   database: runner/db/development.sqlite3   timeout: 5000

7. Run the application on GlassFish v3 gem as:
   

   ~/samples/jruby >~/testbed/jruby-1.1.2/bin/jruby -S glassfish_rails runner Jun 30, 2008 1:52:08 PM com.sun.enterprise.glassfish.bootstrap.ASMain main INFO: Launching GlassFish on HK2 platform Jun 30, 2008 1:52:08 PM com.sun.enterprise.glassfish.bootstrap.ASMainHK2 findDerbyClient INFO: Cannot find javadb client jar file, jdbc driver not available Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3000 Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.services.impl.GrizzlyEmbeddedHttpConfigurator configureSSL WARNING: pewebcontainer.all_ssl_protocols_disabled Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.services.impl.GrizzlyEmbeddedHttpConfigurator configureSSL WARNING: pewebcontainer.all_ssl_ciphers_disabled Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3131 Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3838 Jun 30, 2008 1:52:09 PM com.sun.enterprise.v3.admin.adapter.AdminConsoleAdapter setContextRoot INFO: Admin Console Adapter: context root: /admin Jun 30, 2008 1:52:09 PM com.sun.grizzly.jruby.RailsAdapter startRubyRuntimePool INFO: Starting Rails instances Jun 30, 2008 1:52:16 PM   SEVERE: JRuby limited openssl loaded. gem install jruby-openssl for full support. http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL Jun 30, 2008 1:52:17 PM com.sun.grizzly.jruby.RubyObjectPool$1 run INFO: JRuby and Rails instance instantiation took : 7998ms Jun 30, 2008 1:52:17 PM org.glassfish.scripting.rails.RailsDeployer load INFO: Loading application runner at / Jun 30, 2008 1:52:17 PM com.sun.enterprise.v3.server.AppServerStartup run INFO: Glassfish v3 started in 9430 ms

After adding couple of entries, “http://localhost:3000/runs” looks like:

So now you can use SQLite3 as your development database for Rails applications running on GlassFish v3 Gem.

Here are some useful pointers:

• Running Rails with ActiveRecord-JDBC
• SQLite3 man page provides complete set of commands for this database.
• GlassFish v3 Gem 0.3.1
• Rails powered by the GlassFish Application Server
• Getting Started with JRuby on GlassFish

Please leave suggestions on other TOTD (Tip Of The Day) that you’d like to see. A complete archive is available here.

Technorati: totd rubyonrails jruby ruby sqlite sqlite3 glassfish v3 gem

Related posts:

1. TOTD #26: Overriding Database Defaults in Rails 2.0.2
2. TOTD #104: Popular Ruby-on-Rails applications on GlassFish v3 – Redmine, Typo, Substruct
3. TOTD #76: JRuby 1.2, Rails 2.3, GlassFish Gem 0.9.3, ActiveRecord JDBC Adapter 0.9.1 – can they work together ?
4. TOTD #110: JRuby on Rails application using Oracle on GlassFish
5. TOTD #111: Rails Scaffold for a pre-existing table using Oracle and GlassFish