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Project Notes

Ruby on Rails 5

Features and demonstration of Rails 5.


Key Features of Rails 5

  • Action Cable
  • Rails API
  • Active Record Attributes API
  • Test Runner
  • Exclusive use of rails CLI over Rake
  • Sprockets 3
  • Turbolinks 5
  • Ruby 2.2.2+ required

Checking Pre-requisites and Installation

$ ruby -v
ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin17]
$ sqlite3 --version
3.19.3 2017-06-27 16:48:08 2b0954060fe10d6de6d479287dd88890f1bef6cc1beca11bc6cdb79f72e2377b
$ gem install rails -v 5.2.2
$ rails --version
Rails 5.2.2

Creating a Simple App

$ rails new minime5
$ cd minime5
$ rails db:migrate
$ rails server
=> Booting Puma
=> Rails 5.2.2 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.0 (ruby 2.6.0-p0), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://
Use Ctrl-C to stop

Gem::LoadError: can’t activate sqlite3 (~> 1.3.6), already activated sqlite3-1.4.0. Make sure all dependencies are added to Gemfile.

Update Gemfile to pin gem 'sqlite3', '~> 1.3.6' and re-run bundle

Hit http://localhost:3000..


Adding a Welcome Page

Using controller generator:

bin/rails generate controller Welcome index

Adjust routes to use this as the main page.



$ rake test
Run options: --seed 30795

# Running:


Finished in 0.575177s, 1.7386 runs/s, 1.7386 assertions/s.
1 runs, 1 assertions, 0 failures, 0 errors, 0 skips

Adding The Blog App

The getting started guide has always outlined a simple blog application. Adding the basic features to minime5:

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

Credits and References

About LCK#48 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.