Ruby Training (2014-?)

Provisioning

• OS on bare metal
• OS on VM
• Container on OS on VM - Vagrant and Docker example

Controlling the Ruby Version Environment

Analogous to chroot. Pick one of these

1. RVM

   RVM refers to sandboxes (interpreters, gems, and irb [REPL]) as gemsets.
   Example: installing RVM and a specific Ruby version, at once; then creating a gemset linking this Ruby to a Rails version, and installing the latter.
   

   $ curl -sSL https://get.rvm.io | bash -s stable --ruby=2.1.2
$ rvm use ruby-2.1.2@rails4.1.0 --create
$ gem install rails --version=4.1.0

2. rbenv

   app_name/
├── bin/
│ └── stuff
├── lib/
│ └── stuff.rb
├── README
└── .ruby-version

Package Management

Analogous to apt-get, npm. Packages are called gems.

• The gem executable

  RubyGems (on Wikipedia), is part of the Ruby standard library. (I'm not sure if RubyGems is itself considered to be a gem.)
  

  • Gem pre/installation convention

    $ gem build gem_name.gemspec
$ gem install gem_name-version.gem

  • Gem directory structure

    gem_name/
├── bin/
│ └── gem_name
├── lib/
│ └── gem_name.rb
├── test/(or spec/)
│ └── test_gem_name.rb
├── README
├── Rakefile
└── gem_name.gemspec (the specification)

• The Bundler gem

  Bundler takes care of dependency management for applications ("apps").
  

  • The bundle executable

    Example:
    

    $ cd app_name
$ bundle install

    (manual)

  • App directory structure

    Example, a Rails 4.x app:
    

    app_name/
├── app/
├── bin/
├── config/
├── db/
├── doc/
├── lib/
├── log/
├── public/
├── test/
├── tmp/
├── vendor/
├── Capfile (used by Capistrano)
├── config.ru (used by Rack)
├── Gemfile
├── Gemfile.lock
├── Rakefile
└── README.rdoc



  • Gemfile

    This file describes the dependencies of the current gem (refer to the Gemfile manual). Each required dependency is specified as a range of acceptable versions.

  • Gemfile.lock

    This file records the specific version that was installed, for each required dependency
    
    Commit this if you are developing an app; but not if you are developing a gem.

  • rbenv-binstubs

Task Automation ("Task Running")

"This plugin makes rbenv transparently aware of project-specific binstubs created by bundler.

This means you don't have to type bundle exec ${command} ever again!"

• The Rake gem

  Analogous to make - takes a Rakefile as input.

Deployment

• The Rack gem

  An interface between webservers, and Ruby applications. A quick intro.

• The Capistrano gem

  A remote multi-server automation tool.

Implementation Shoot-outs

For the tuning freaks.

• 2013-10-05

  • baseline (MRI 1.9.3, 2.0.0, 2.1.0dev)
  • JVM (JRuby 1.7.4)
  • LLVM (Rubinius 2.0.0)

---

every minute is punctuated by me swearing at the hipster tendency to avoid calling a spade a spade. Call it a motherfucking library for fucks's sake... lol. Gem, gemspec, gemfile, bundler, barometer, constantinople, blistering barnacles, dickwad... -_-

... which brings me back to my life's work of demonstrating that there's nothing hard about math / technology - a lot of the friction in pedagogy is due to EPIC, INFORMALLY NAMED SCHEMATA.

#morphology