rails version is 4.2.5.1
enumerize
支持国际化的enum，提供了scope……(enum through hash, let we can use scope, i18n for enum without redefine)
paranoia
用deleted_at字段soft destroy(through add deleted_at column and cover the destroy method achieve soft destroy)
active_model_serializers
方便自定义model中的字段组合成json数据（api中的利器）(helpful during the api return json with customize column from model)
exception_notification
当系统出现错误的时候发送邮件(send email to you when occur web system error)
prawn, prwan-table
通过prawn语法代码生成pdf，精确度高(generate pdf through code, very accurate)
pdfkit
通过已有的html页面生成pdf,精确度不是很高(generate pdf through exist html page but not accurate )
sidekiq
多线程的后台任务处理器(multithreading background processing)
redis
内存数据库(Memory Database)
simple_form
简化rails form 表单的代码量(Rails forms made easy.)
pundit
一个简单可扩展的强大的权限插件(a simple, robust and scaleable authorization gem)
rails-api
快速简单的提供api，（Rails5已经集成）不需要加载所有的rails组件(has integrated at Rails5, quick walk-through to help you get up and running with Rails::API to create API-only Apps,)
ransack
一个的搜索插件(a simple and flexible gem for search with conditions)
kaminari
一个的分页插件(a simple and flexible gem for pagination)
carrierwave
一个上传插件(a simple and flexible gem for upload things)
factory_girl_rails, ffaker
造假数据(provide function for faker data)
database_cleaner
数据库清除插件(is a set of strategies for cleaning your database)
rspec-rails, rspec, webmock
测试用插件(gem for spec)
capistrano, capistrano-rails, capistrano3-puma, capistrano-rvm, capistrano-sidekiq
发布脚本(gem for cap)
