jraines

##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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##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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#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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• 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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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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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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Use this format to assign variables:

$error-red: #911

Transformations:

background-color: lighten(red, 10%)

Functions:

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###Autocomplete

• the big lebowski
• Prefix search
• rails-3-jquery-autocomplete Gem
  • rails g autocomplete
  • javascript_include_tag "autocomplete-rails.js"
  • autocomplete :resource, :title #, :full => true
  • autocomplete_field_tag
• Not really flexible over multiple models

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Implementation of the Reactor pattern

• Most web apps are I/O bound, not CPU bound
• Instead of waiting on a response from the network, use that time to process other requests
• Handle 5-10k concurrent connections with a single Ruby process

EM.run do 
  EM.start_server '0.0.0.0', 2202, EchoServer
end

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####Scope your gems to your app:

bundle install --path vendor/bundle

####Ensure that bundle install has been run locally

(ie, there are no gems in Gemfile that do not match the lockfile

bundle install --frozen