jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

bensomers

# Fix for a Rails - Ruby 1.9 bug
# Rails Router, now that it's UTF-8 default, blows up when routing requests
# with invalid chars in the URL; it should properly return a 400 error
# Have to monkey-patch the fix in, since it's not scheduled for release until
# Rails 4.0.
# Adapted Andrew White (pixeltrix)'s fix at 
# https://github.com/rails/rails/commit/3fc561a1f71edf1c2bae695cafa03909d24a5ca3,
# but edited to work in 3.0.x.
# 3.1.x, 3.2.x compatibility unknown
require 'action_dispatch/routing/route_set'

panthomakos

#!/usr/bin/env ruby

require 'benchmark'

REGEXPS = [
  /^no such file to load -- (.+)$/i,
  /^Missing \w+ (?:file\s*)?([^\s]+.rb)$/i,
  /^Missing API definition file in (.+)$/i,
  /^cannot load such file -- (.+)$/i,
]

sidane

# Resize selenium browser window to avoid Selenium::WebDriver::Error::MoveTargetOutOfBoundsError errors
#
# Example usage with Rspec (in spec/support/spec_helper.rb):
#     
#   config.before(:each) do
#     set_selenium_window_size(1250, 800) if Capybara.current_driver == :selenium
#   end
#
def set_selenium_window_size(width, height)
  window = Capybara.current_session.current_window.resize_to

jrochkind

A Capistrano Rails Guide

by Jonathan Rochkind, http://bibwild.wordpress.com

why cap?

Capistrano automates pushing out a new version of your application to a deployment location.

I've been writing and deploying Rails apps for a while, but I avoided using Capistrano until recently. I've got a pretty simple one-host deployment, and even though everyone said Capistrano was great, every time I tried to get started I just got snowed under not being able to figure out exactly what I wanted to do, and figured I wasn't having that much trouble doing it "manually".

henrik

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

webmat

ActiveAdmin::Dashboards.build do
  # Add this section in your dashboard...

  section "Background Jobs" do
    now = Time.now.getgm
    ul do
      li do
        jobs = Delayed::Job.where('failed_at is not null').count(:id)
        link_to "#{jobs} failing jobs", admin_jobs_path(q: {failed_at_is_not_null: true}), style: 'color: red'
      end

marcomd

#Add this new method

#activeadmin-0.4.0\lib\active_admin\views\pages\show.rb
#after def attributes_table
def attributes_table_for_resource(specified_resource, *args, &block)
  panel(I18n.t('active_admin.details', :model => "#{specified_resource.class.name} #{specified_resource.id}")) do
    attributes_table_for specified_resource, *args, &block
  end
end

matthewhudson

<!-- Open Graph tags for your home page (index). -->
<meta property="og:site_name" content="{Title}" />
<meta property="fb:app_id" content="FACEBOOK_APPID"/>
<meta property="fb:admins" content="FACEBOOK_USERID" />
<meta property="og:description" content="{MetaDescription}" />
<meta property="og:locale" content="en_US" />

{block:IndexPage}
	<meta property="og:image" content="{PortraitURL-128}" />
	<meta property="og:title" content="{Title}" />

jrmoran

# Cakefile to document, compile, join and minify CoffeeScript files for
# client side apps. Just edit the config object literal.
#
# -jrmoran

fs            = require 'fs'
{exec, spawn} = require 'child_process'

# order of files in `inFiles` is important
config =