one-knowledge/github-knowledge/ruby.md

title, created, updated, type, tags, external

title	created	updated	type	tags	external
Ruby	2018-06-14	2018-06-14	summary	tech reference	https://github.com/wahyd4/knowledge/blob/master/categories/ruby.md

Objects inheritances

Background jobs

• Resque
  • Single threaded process
• Delayed Job
  • Single process
• Sidekiq
  • Redis and multiple threaded process

      while(!empty(queue)) {
             = get(queue); //从任务队列中取一个(涉及加锁等)
            q->callback(); //执行该任务
        }
    

Test

• Unit Test
  • Mini Test
  • RSpec
• Browser Test
  • Capybara
  • Cucumber
• Mock
  • Mocha

Auth

• OmniAuth
• Devise

Web Server

• Thin
• Unicorn
• Puma
• Passenger
• Pow

Language

• Syntax
  • lambda
  • yield
  • respond_to
  • send
  • <=>
    • return 1,0, -1
  • • before array
      • splat operator: split an array into a list of arguments
  • array << obj
    • append obj to new arry
• block {} do end
  • Block is not object
  • use yield pass block
• Proc
  • Proc is object
  • greeting = Proc.new { puts "hello, world" } greeting.call
• Module
  • Can't be new
  • include
  • can't extend
• Class

Code analysis

• Rubocop

GC

• Minor GC
• Major GC
• GC.stat

Bundler

Use groups in bundler

# These gems are in the :default group
gem 'nokogiri'
gem 'sinatra'

gem 'wirble', :group => :development

group :test do
  gem 'faker'
  gem 'rspec'
end

group :test, :development do
  gem 'capybara'
  gem 'rspec-rails'
end

gem 'cucumber', :group => [:cucumber, :test]

when you install bundles, you can do

bundle install --without test development

Web frameworks

Sintra

Ruby on Rails

How Rails application works

- ORM
	- Active record
	- Mongoid
- Websocket
- Assets pipeline
- Rails console

Gem mirrors

• http://mirrors.aliyun.com/rubygems/
• https://gems.ruby-china.org