jraines

Vagrant

gem install vagrant

vagrant up

vagrant halt

• Ruby DSL for provisioning VirtualBox VMs
• creates a user named vagrant, with password 'vagrant'

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Confident Code

timid code

• Randomly mixes input gathering, error handling, and business logic
• imposes cognitive load on the reader

confident code

• no digressions

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• Marshaling AR objects: dangerous if internal structure of AR object changes with Rails change

Relaxing consistency requirements

• Is it ok for users to see slightly older data?

Configuring

• Initializer that loads yaml file that loads different connections per Rails environtment

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#This goes in application.rb

require 'active_support/dependencies'
module ActiveSupport::Dependencies
  alias_method :require_or_load_without_multiple, :require_or_load
  def require_or_load(file_name, const_path = nil)
    if file_name.starts_with?(Rails.root.to_s + '/app')
      relative_name = file_name.gsub(Rails.root.to_s, '')
      @engine_paths ||= Rails::Application::Railties.engines.collect{|engine| engine.config.root.to_s }
      @engine_paths.each do |path|

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##Scope and intro

I will be focusing on Rails 3 since this will be most applicable for greenfield development, and because there are Rails 2 bugs. To get started add the following to the Gemfile:

group :test do
  gem 'cucumber'
  gem 'cucumber-rails'
  gem 'capybara'
 gem 'database_cleaner'

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##Intro

Janus is a "basic distribution of vim plugins and tools intended to be run on top of the latest MacVIM snapshot." It is maintained by Yehuda Katz and Carl Lerche.

I recently whinged on Twitter that all I really want is vim with TextMate's Command-T go-to-file functionality and some efficient visual tab/buffer navigation. Turns out MacVim + Janus, with just a few tweaks, is all that and more.

Installing Janus

Follow the installation instructions on the git page

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Before starting work on a feature, check out a topic branch

git checkout -b topic

If the branch is already in progress and already exists on the remote repo, check it out as a tracking branch

git checkout --track -b topic origin/topic

Push the branch to your remote repo so others can work on it

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#two questions -- why does .count not return the narrowed down result set size, and why does .where seem to alter variable a?

a = Star.where(:brightness => 0)
=> #<Mongoid::Criteria:0xb6af2948 @documents=[], @options={}, @selector={:brightness=>0}, @klass=Star>

a.size
=> 1430

a.count
=> 1430

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#testing the speed of creating a new object via the association with mongoid

c = Club.first

#######  43 seconds #######
begin
  500.times do |i|
    c.people.create(:name => 'Jim')
  end
end

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-unless current_user.workouts.member?(workout)
   =link_to image_tag('checkin.png'), checkin_url(:workout_id => workout.id, :user_id => current_user.id)
 -else
   =image_tag('done.png')