shinzui

# If your workers are inactive for a long period of time, they'll lose
# their MySQL connection.
#
# This hack ensures we re-connect whenever a connection is
# lost. Because, really. why not?
#
# Stick this in RAILS_ROOT/config/initializers/connection_fix.rb (or somewhere similar)
#
# From:
#   http://coderrr.wordpress.com/2009/01/08/activerecord-threading-issues-and-resolutions/

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

Bertg

These are some snips to help you converting video to flash and thumbnails using ruby and paperclip.

Needed: ffmpeg & flvtool, RVideo gem, paperclip 

Converting the video is done using outside of paperclip, as this could take quite a while. Paperclip by default does it's conversions during the request, and the last thing you want is a request hanging for 10minutes while ffmpeg does it's thing. It is advised to do this conversion somewhere in the background using Resque or DelayedJob. (make sure not to run to many conversions at one time on your machine)

Most video thumbnailing solutions out there will create all thumbnails from the video. This solution (on paperclip 2.3.0) however will create one large "temp_thumbnail" once and all consequent thumbnails can use this temporary version.

VideoGeometry will make sure that the target dimensions for ffmpeg are always a multiple of 2 and as close as possible to the desired dimensions without breaking the aspect ratio of the original video.

andrzejsliwa

    # based on http://www.natontesting.com/2010/01/11/updated-script-to-list-all-cucumber-step-definitions/
    #
    desc 'List all defined steps'
    task :steps do
      require 'hirb'
      extend Hirb::Console
      puts "CUCUMBER steps:"
      puts ""
      step_definition_dir = "features/step_definitions"

german

# run with: god -c /path/to/config.god [add -D if you want to not-deamonize god] 
# This is the actual config file used to keep the delayed_job running 

APPLICATION_ROOT = "/var/www/application"
RAILS_ENV = "production"

God.watch do |w| 
  w.name = "delayed_job_production"
  w.interval = 15.seconds 
  w.start = "/bin/bash -c 'cd #{APPLICATION_ROOT}/current; /usr/bin/env RAILS_ENV=#{RAILS_ENV} #{APPLICATION_ROOT}/current/script/delayed_job start > /tmp/delay_job.out'"

tjl2

cron "passenger_monitor_#{app_name}" do
  action :delete
end

cron "passenger_monitor_#{app_name}" do
  minute  '*'
  hour    '*'
  day     '*'
  month   '*'
  weekday '*'

markoa

namespace :deploy do
  desc "Hot-reload God configuration for the Resque worker"
  task :reload_god_config do
    sudo "god stop resque"
    sudo "god load #{File.join(deploy_to, 'current', 'config', 'resque-' + rails_env + '.god')}"
    sudo "god start resque"
  end
end

# append to the bottom:

tjl2

This was going to go into a blog post, but was removed after discussion around it being a Bad Thing for customers to do.

Changing the count and memory limit of Passenger processes

To stop applications that are prone to bloating quickly exhausting all the memory on an application instance, we have a script called passenger_monitor that checks for runaway Passenger processes every minute via a cron job. By default, this script is going to look for Passenger workers that are using over 215MB of memory and kill them. Passenger will restart them when needed. We tune the number of workers that run by default on your application instances, based on the memory specifications so that the memory is sensibly utilized. However, if your application legitimately requires more memory than this (i.e. it isn’t bloating) then it may be advantageous for you to reduce the worker count, and allow the lower number of workers to use more memory.

Doing this involves two areas of customization; modifying the Nginx configuratio

eparreno

$ brew install libmagic
$ brew link libmagic  (if the link is already created is going to fail, don't worry about that)
$ env ARCHFLAGS="-arch x86_64" gem install ruby-filemagic -- --with-magic-include=/usr/local/include --with-magic-lib=/usr/local/lib/

r10r

#!/usr/bin/env ruby
# extracts the embedded PNG data from .skitch SVG files

require 'nokogiri'
require 'base64'

IMAGE_HEADER = "data:image/png;base64,"

ARGV.each do |filename|
  svg_document = Nokogiri::XML(File.open(filename))