mikhailov

# NOTICE: to get Nginx+Unicorn best-practices configuration see the gist https://gist.github.com/3052776

  $ cd /usr/src
  $ wget http://nginx.org/download/nginx-1.2.1.tar.gz
  $ tar xzvf ./nginx-1.2.1.tar.gz && rm -f ./nginx-1.2.1.tar.gz

  $ wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.30.tar.gz
  $ tar xzvf pcre-8.30.tar.gz && rm -f ./pcre-8.30.tar.gz

  $ wget http://www.openssl.org/source/openssl-1.0.1c.tar.gz

aliang

class ApplicationController < ActionController::Base
  # Tell Devise to redirect after sign_in
  def after_sign_in_path_for(resource_or_scope)
    some_url(:protocol => 'http')
  end

  # Tell Devise to redirect after sign_out
  def after_sign_out_path_for(resource_or_scope)
    some_url(:protocol => 'http')
  end

rorcraft

# I put this as spec/support/factory_girl_singleton.rb
# this get required from spec_helper.rb
# creates a class variable for factories that should be only created once
class Factory
  @@singletons = {}  
  def self.singleton(factory_key)
    begin      
      @@singletons[factory_key] = Factory.create factory_key 
    rescue ActiveRecord::RecordInvalid, ActiveRecord::RecordNotUnique
    end

jcasimir

Friendly URLs

By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:

/people/6

But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.

bdunagan

#!/usr/bin/env ruby

# s3-delete-bucket.rb
# Fog-based script for deleting large Amazon AWS S3 buckets (~100 files/second)
# Forked from this excellent script: https://github.com/SFEley/s3nuke

require 'rubygems'
require 'thread'
require 'fog'

jcsrb

class ArticleImageUploader < ImageUploader

  process :fix_exif_rotation
  process :strip
  process :convert => 'jpg'
  process :quality => 85 # Percentage from 0 - 100

  version :gallery_thumb do
    process :resize_to_fill => Settings.images.article_images.processing.gallery_thumb #44x44
  end

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".

loisaidasam

# One liner for counting unique IP addresses from nginx logs
# Feel free to comment with better ideas - I'm sure it's not the best way of doing this (I'm no awk ninja!)
#
# Sample output:
# 
# $ cat example.com.access.log | awk -F " " '{a[$1]++ } END { for (b in a) { print b, "\t", a[b] } }'
# 66.65.145.220 49
# 92.63.28.68 126

cat example.com.access.log | awk -F " " '{a[$1]++ } END  { for (b in a) { print b, "\t", a[b] } }'

mungruby

fields = [:switch, :sha_ind, :dtdm, :utdm, :ttdm, :actual]

def create_struct name, fields
  Struct.new(name, *fields)
end

def create_singleton_struct name, fields
  if Struct::const_defined? name
    Struct.const_get name
  else

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