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def find_in_batches(criteria, batch_size = 1000, sleep_seconds = 1)
  current_batch = 0
  count = criteria.count

  while count > 0 do
    criteria.skip(current_batch * batch_size).limit(batch_size).collect{|doc| yield doc}
    count -= batch_size
    current_batch += 1
    #logger.info "now picked #{current_batch * batch_size}, batch_size is #{batch_size} then sleep #{sleep_seconds}'s ..."
    sleep sleep_seconds

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Routes

小心地使用 Match（Rails 3 已实现）

Rails 3 提供了 match 方法供我们自定义 routes，然而我们要小心使用它以避免“跨站脚本攻击”（XSS Attack）。比如像这样的 routes：

注：（r3 代表 Rails 3，r4 代表 Rails 4）

# routes.rb

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# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby
# - a browser with WebSocket support
#
# Usage:
# ruby redis_pubsub_demo.rb
#

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after "deploy:symlink", "deploy:restart_workers"
after "deploy:restart_workers", "deploy:restart_scheduler"

##
# Rake helper task.
# http://pastie.org/255489
# http://geminstallthat.wordpress.com/2008/01/27/rake-tasks-through-capistrano/
# http://ananelson.com/said/on/2007/12/30/remote-rake-tasks-with-capistrano/
def run_remote_rake(rake_cmd)
  rake_args = ENV['RAKE_ARGS'].to_s.split(',')

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# Nginx+Unicorn best-practices congifuration guide. Now with SPDY!
# We use latest stable nginx with fresh **openssl**, **zlib** and **pcre** dependencies.
# Some extra handy modules to use: --with-http_stub_status_module --with-http_gzip_static_module
#
# Deployment structure
#
# SERVER:
#  /etc/init.d/nginx                             (1. nginx)
#  /home/app/public_html/app_production/current  (Capistrano directory)
#

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# lib/custom_logger.rb
class CustomLogger < Logger
  def format_message(severity, timestamp, progname, msg)
    "#{timestamp.to_formatted_s(:db)} #{severity} #{msg}\n"
  end
end

logfile = File.open("#{Rails.root}/log/custom.log", 'a')  # create log file
logfile.sync = true  # automatically flushes data to file
CUSTOM_LOGGER = CustomLogger.new(logfile)  # constant accessible anywhere

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module ActsAsTaggable

  module Taggable
    def self.included(base)
      base.field :tags, :type => Array, :default => []
    end
  end
  
  module Tagger
    def tag(object, tags)

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Implement Routing for Subdomains

Rails 3.0 introduced support for routing constrained by subdomains.

A subdomain can be specified explicitly, like this:

match '/' => 'home#index', :constraints => { :subdomain => 'www' } 

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require 'my-sinatra-app'
require 'sinatra/activerecord/rake'

desc "run irb console"
task :console, :environment do |t, args|
  ENV['RACK_ENV'] = args[:environment] || 'development'

  exec "irb -r irb/completion -r my-sinatra-app"
end

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@media print {
  .col-sm-1, .col-sm-2, .col-sm-3, .col-sm-4, .col-sm-5, .col-sm-6, .col-sm-7, .col-sm-8, .col-sm-9, .col-sm-10, .col-sm-11, .col-sm-12 {
    float: left;
  }
  .col-sm-12 {
    width: 100%;
  }
  .col-sm-11 {
    width: 91.66666667%;
  }