jhjguxin

sharing-a-devise-user-session-across-subdomains

two key words, sample cookie_store key and secret_key_base devise_secret_key

Rails.application.config.session_store :cookie_store, key: "vcooline_ikcrm#{Rails.env}_#{SESSION_DOMAIN.try(:underscore)}_session", :domain => :all, :expire_after => 86400*90, :tld_length => 2

You might get weird things like halfway Devise sessions sharing, but only allowing you to create and destroy the session on the root domain. Using :all works great if you’re using localhost, but when I started using lvh.me:3000 for testing I had those problems (lvh.me stands for local vhost me and is a domain that simply points to localhost which makes for zero-config subdomain development. It’s super handy.).

get 'crm_base_agent/', to: "crm_base_agent#index"

jhjguxin

set :linked_files, %W{
                       ... config/app.god config/qrsync.json
                       config/application.yml
                     }

# you should remove bin from linked_dirs config
# https://github.com/capistrano/bundler/issues/45
set :linked_dirs, %w{config/unicorn log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

namespace :deploy do

jhjguxin

headless browser

puppeteer vs jsdom vs phantomjs

• jsdom

jsdom 是一个轻量级的 headless browser, 基于原生的 js 实现 不过不能渲染布局, 具体可以参考 https://github.com/jsdom/jsdom/wiki/jsdom-vs.-PhantomJS

• PhantomJS

jhjguxin

http://www.zhlwish.com/2012/07/23/rails-activesupport-concern/

# autoload concerns
module YourApp
  class Application < Rails::Application
    # config.autoload_paths += %W(
    #     #{config.root}/app/controllers/concerns/
    #      #{config.root}/app/models/concerns/
    #   )

jhjguxin

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

##
# 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(',')
  cmd = "cd #{fetch(:latest_release)} && #{fetch(:rake, "rake")} RAILS_ENV=#{fetch(:rails_env, "production")} #{rake_cmd}"

jhjguxin

make a Virtual Router on Ubuntu 13.04

Run this in a terminal:

sudo apt-get install hostapd

Then, open a text editor program, for example gedit. Copy the following into it.

• http://wireless.kernel.org/en/users/Documentation/hostapd#Establishing_Baseline_for_Configuration

jhjguxin

class RingBuffer < Array
  attr_reader :max_size
 
  def initialize(max_size, enum = nil)
    @max_size = max_size
    enum.each { |e| self << e } if enum
  end
 
  def <<(el)
    if self.size < @max_size || @max_size.nil?

jhjguxin

Low memory consumption with MongoDB

resouces

• http://stackoverflow.com/questions/15359271/low-memory-consumption-with-mongodb
• http://www.kchodorow.com/blog/2012/05/10/thursday-5-diagnosing-high-readahead/
• http://serverfault.com/questions/408100/mongodb-and-datasets-that-dont-fit-in-ram-no-matter-how-hard-you-shove
• http://markmail.org/message/utuxcatjdgxwe72z
• http://docs.mongodb.org/manual/administration/production-notes/#readahead
• http://linux.die.net/man/8/blockdev

jhjguxin

/*JS自带函数
concat
将两个或多个字符的文本组合起来，返回一个新的字符串。
var a = "hello";
var b = ",world";
var c = a.concat(b);
alert(c);
//c = "hello,world"
indexOf
返回字符串中一个子串第一处出现的索引（从左到右搜索）。如果没有匹配项，返回 -1 。

jhjguxin

echo "Updates packages. Asks for your password."
sudo apt-get update -y

echo "Installs packages. Give your password when asked."
sudo apt-get install build-essential bison openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev -y

echo "Installs ImageMagick for image processing"
sudo apt-get install imagemagick --fix-missing -y

echo "Installs RVM (Ruby Version Manager) for handling Ruby installation"