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Project Notes

Ruby on Rails 3

Features and demonstration of Rails 3.


Key Features of Rails 3

  • Brand new router with an emphasis on RESTful declarations
  • New Action Mailer API modeled after Action Controller (now without the agonizing pain of sending multipart messages!)
  • New Active Record chainable query language built on top of relational algebra
  • Unobtrusive JavaScript helpers with drivers for Prototype, jQuery, and more coming (end of inline JS)
  • Explicit dependency management with Bundler

Checking Pre-requisites and Installation

$ ruby -v
ruby 2.1.9p490 (2016-03-30 revision 54437) [x86_64-darwin14.0]
$ sqlite3 --version
3.19.3 2017-06-27 16:48:08 2b0954060fe10d6de6d479287dd88890f1bef6cc1beca11bc6cdb79f72e2377b
$ gem install rails -v
$ rails --version

Creating a Simple App

$ rails new minime3
$ cd minime3
$ rake db:migrate
$ rails server
=> Booting WEBrick
=> Rails application starting in development on
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2019-02-25 15:01:01] INFO  WEBrick 1.3.1
[2019-02-25 15:01:01] INFO  ruby 2.1.9 (2016-03-30) [x86_64-darwin14.0]
[2019-02-25 15:01:01] INFO  WEBrick::HTTPServer#start: pid=97453 port=3000

Note, pegged some gems to avoid version issues:

  • sqlite3
  • rb-fsevent, rb-inotify

Hit http://localhost:3000..


Adding a Welcome Page

Using controller generator:

rails generate controller Welcome index

Adjust routes to use this as the main page.



$ rake test
... lots of: warning: File.exists? is a deprecated name, use File.exist? instead
Run options:

# Running tests:

Finished tests in 0.141508s, 7.0667 tests/s, 7.0667 assertions/s.
1 tests, 1 assertions, 0 failures, 0 errors, 0 skips

ruby -v: ruby 2.1.9p490 (2016-03-30 revision 54437) [x86_64-darwin14.0]

Adding The Blog App

The getting started guide has always outlined a simple blog application. Adding the basic features to minime3:

rails generate controller Articles
rails generate model Article title:string text:text
rake db:migrate

Credits and References

About LCK#46 rubyrails
Project Source on GitHub Return to the Project Catalog

This page is a web-friendly rendering of my project notes shared in the LittleCodingKata GitHub repository.

LittleCodingKata is my collection of programming exercises, research and code toys broadly spanning things that relate to programming and software development (languages, frameworks and tools).

These range from the trivial to the complex and serious. Many are inspired by existing work and I'll note credits and references where applicable. The focus is quite scattered, as I variously work on things new and important in the moment, or go back to revisit things from the past.

This is primarily a personal collection for my own edification and learning, but anyone who stumbles by is welcome to borrow, steal or reference the work here. And if you spot errors or issues I'd really appreciate some feedback - create an issue, send me an email or even send a pull-request.