Initial import: links posts + github knowledge

github-knowledge/ruby.md

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+---
+title: Ruby
+created: 2018-06-14
+updated: 2018-06-14
+type: summary
+tags: [tech, reference]
+external: https://github.com/wahyd4/knowledge/blob/master/categories/ruby.md
+---
+
+# Objects inheritances
+
+![objects](https://toozhao.com/knowledge-mind-mapping/Knowledge.mindnode/resources/0F278DB4-4103-44BA-BCBF-EB702C63D097.png)
+
+# Background jobs
+- Resque
+	- Single threaded process
+- Delayed Job
+	- Single process
+- Sidekiq
+	- Redis and multiple threaded process
+      ```ruby
+        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
+
+```ruby
+# 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
+
+```bash
+bundle install --without test development
+```
+# Web frameworks
+## Sintra
+
+## Ruby on Rails
+
+### How Rails application works
+
+![Rails flow](https://raw.githubusercontent.com/wahyd4/knowledge-mind-mapping/master/Knowledge.mindnode/resources/01193273-3E02-4AB0-ADE9-037F1577CCB0.png)
+
+	- ORM
+		- Active record
+		- Mongoid
+	- Websocket
+	- Assets pipeline
+	- Rails console
+
+# Gem mirrors
+- [http://mirrors.aliyun.com/rubygems/](http://mirrors.aliyun.com/rubygems/)
+- [https://gems.ruby-china.org](https://gems.ruby-china.org)