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win = Ti.UI.createWindow()

wrapNorth = (y) -> 
  if y is 0
    36
  else
    y - 1

wrapSouth = (y) ->
  if y is 36

jraines

fixture_file_upload is a good way to simulate an uploaded file in tests. In Rspec, make sure to include ActionDispatch::TestSupport

Useful Rspec custom matcher to write: with_layout(layout)

assign(:variable, 'value') in your specs

Anonymous controllers in tests for testing filters

Testing nested hashes

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###If I'm just sending JSON back and forth, why do I need Rails?

Rails is a rich HTTP abstraction, handles a lot for you

Read the HTTP spec

##ActionDispatch

###Middleware

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Don't block the reactor loop

Use blocks as callbacks

Use async libraries

EM.start_server('0.0.0.0', 1337, ChatClient)

Instance variables keep state on a per Connection basis

jraines

Note - reference these slides; good diagrams

##High traffic

Problem: Heavy lifting inside the request cycle

• Bound by slowest API
• Potential redundant retrieval (popular search term)

The Worker Pattern decouples web request from services required to respond to request

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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

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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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Use this format to assign variables:

$error-red: #911

Transformations:

background-color: lighten(red, 10%)

Functions:

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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'