绯火琉瞳的专栏

gem 'bartt-ssl_requirement', '~>1.4.0', :require => 'ssl_requirement'存储# Memcachedgem 'dalli', '~> 2.7.0'# Redisgem "nest"gem "redis-namespace"gem "redis-rails"gem 'paperclip'脚本gem "delayed_job"g

在不使用ActiveSupport::Concern，通常module的写法如下：module Foo module ClassMethods #... end module InstanceMethods #... end def self.included(base) base.extend ClassMethods base.se

render :partial 局部渲染<%= render :partial => '/shared/mails/list' %>渲染/shared/mails/_list.html.erb到当前模板的当前位置，例如可以写一个list模板来渲染一组数据显示.传递变量<%= render :partial => '/shared/mails/list'， :locals => { :mails

据说使用 Time 计算时间差要比 DateTime 快（有空要去验证下...）dif = Time.now - begin_timeminutes_to_add = dif.div(60) seconds = dif.to_i.modulo(60) hours = minutes_to_add.div(60) minutes = minutes_to_add.modulo(

UTC: 协调世界时，以原子时秒长为基础....（度娘）GMT: 世界时，以地球自转为基础...（度娘）mysql 中 timestamp 类型，内部存储4个字节，存储的时候转换为UTC时间存储，检索时再转换回当前的时区( time zone ).ROR 中获取及设置time zone~> Time.zone # => (GMT+00:00) UT

encode and decodehttp://api.rubyonrails.org/classes/ActiveSupport/JSON.htmlsize of string"string".size"string".bytesizeencoding of string"string".encodingString::encode# as

zip(arg, ...)Converts any arguments to arrays, then merges elements of selfwith corresponding elements from each argument.This generates a sequence of ary.size n-elementarrays, wheren is one m

Can't find Magick-config in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/var/yr/truck/yrservice

1. require和load用于包含文件，include则用于包含模块2

apt-get install ruby1.9.1gem update --system(ERROR: Failed to build gem native extension.)?-> apt-get install ruby1.9.1-dev-> gem install rubygems-update$ gem install sqlite3 --no-ri --no-rdoc

（Cache，Asynchronous，Concurrent）前端性能优化网页瘦身，降低带宽消耗。 尽量少的使用图片及大体积的东西。合并js、css文件以减少请求加载次数页面静态化DNS负载均衡 CDN，Content Delivery Network，即内容分发网络后台性能优化数据库部分 数据冗余 将数据库的数据冗余处理，以减少大表连接查询数据镜像数据分区逻辑Cache