jhjguxin

# http://stackoverflow.com/questions/4397412/read-edit-and-write-a-text-file-line-wise-using-ruby
# files = Dir.glob(File.dirname(__FILE__)+"/../app/**/*.rb")
files = Dir[Rails.root.join("app", "**/*.rb")]

files.each do |f_name|
  # puts f_name
  File.open(f_name, "r+") do |f|

    old_pos = 0
    f.each do |line|

jhjguxin

how switch master/slave between replSet model on mongodb

http://www.cnblogs.com/shihao/archive/2013/01/25/2876727.html

assume

• Physical machine 192.168.10.168 ubuntu 13.04

  • alway as master db

• virtual machine 192.168.10.167 ubuntu 13.04

jhjguxin

MongoDB Monitoring Service Tutorial

• https://mms.10gen.com/
• http://blog.nosqlfan.com/html/3171.html
• https://mms.10gen.com/help/monitoring/tutorial/

To begin using the MongoDB Monitoring Service:

• install the MMS Agent for UNIX/Linux, or install the MMS Agent for Windows, and
• deploy MMS in Production

jhjguxin

Config Rails 3 with dalli(memcahed)

To install dalli in your Rails 3 app, simply add the following to your Gemfile and run bundle install.

# Gemfile
gem "dalli", "~> 2.6.4",   :platforms => :ruby

To setup Rails to use the Dalli client for production, add the following to config/environments/production.rb:

jhjguxin

    /***
     * 获得当前时间
     */ 
function getCurrentDate(){ 
        return new Date(); 
    }; 
    
//今年以来的起止时间段
function getThisYear(){
  //起止日期数组  

jhjguxin

#No such file to load -- devise/confirmations_controller
#resque worker devise not eager loading

require File.expand_path('../config/application', __FILE__)
require 'rake/dsl_definition'
require 'resque/tasks'

Askjane::Application.load_tasks

task "resque:setup" => :environment do

jhjguxin

## rails runner script/generate_source_tracker_link.rb
#eg: version_number: 20130116-1-1 #data-1(早)/2(晚)-1(article_number)
class GeneraterSourceTracker
  #include ActionView::Helpers
  #include ActionView::Helpers::UrlHelper
  include Rails.application.routes.url_helpers
  delegate :url_helpers, to: 'Rails.application.routes'
  delegate :helpers, to: 'ActionController::Base'
  
  def tracker_url(source_tracker)

jhjguxin

.first vs .limit(1) performance?

Q:

Hi there, I noticed the following:

This query:

AvailabilityUpdate.where(hotel_id: "AT_INN_BINDERS").only(:timestamp).limit(1).entries.first.timestamp

jhjguxin

Git 比较不同版本文件差异的常用命令格式：

git diff                                       查看尚未暂存的文件更新了哪些部分

git diff filename 查看尚未暂存的某个文件更新了哪些

git diff –cached                    查看已经暂存起来的文件和上次提交的版本之间的差异

git diff –cached filename 查看已经暂存起来的某个文件和上次提交的版本之间的差异

jhjguxin

Unicorn: Rack HTTP server for fast clients and Unix

Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Slow clients should only be served by placing a reverse proxy capable of fully buffering both the the request and response in between Unicorn and slow clients.

Features

• Designed for Rack, Unix, fast clients, and ease-of-debugging. We cut out everything that is better supported by the operating system, nginx or Rack.
• Compatible with both Ruby 1.8 and 1.9. Rubinius support is in-progress.
• Process management: Unicorn will reap and restart workers that die from broken apps. There is no need to manage multiple processes or ports yourself. Unicorn can spawn and manage any number of worker processes you choose to scale to your backend.
• Load balancing is done entirely by the operating system kernel. Requests never pile up behind a bus