Ruby

study resource

https://github.com/JuanitoFatas/rails-style-guide/blob/master/README-zhTW.md rails code style
https://ihower.tw/rails/ ROR中文實戰聖經！
https://guides.ruby.tw/ https://www.gitbook.com/book/airsonwayne/rocodev-practice-series/details 邁向 Rails 高級新手 http://railsfun.tw/ rails論壇

https://pragprog.com/book/rails51/agile-web-development-with-rails-5-1

https://kaochenlong.com/2014/12/28/ruby-for-rails/ ruby語法放大鏡

ruby syntax style

https://github.com/bbatsov/ruby-style-guide#indent-conditional-assignment

ROR install

$ ruby -e "$(curl -fsSL \
  https://raw.githubusercontent.com/Homebrew/install/master/install)"

$ brew install ruby
$ brew install rbenv ruby-build
$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
$ source ~/.bash_profile

$ rbenv install 2.4.1
$ rbenv global 2.4.1

$ ruby -v

$ gem install rails --version=5.1.3 --no-ri --no-rdoc

$ brew install yarn
$ brew install chromedriver

疑問

block
string.unpack

hash 常規用那一種？
inst_section = {
:cello => 'string',
:clarinet => 'woodwind',
}
inst_section = {
cello: 'string', ...}
Action Cable 機制不熟
turbolinks ?

p.186

rails51/depot_p/app/models/order.rb
class Order < ApplicationRecord

# ...

def add_line_items_from_cart(cart)

    cart.line_items.each do |item|

        item.cart_id = nil

        line_items << item

end 
end
end

if stale?(@latest_order) ??

rails 常用指令

rails new depot  建新專案
bin/rails generate controller {controller name}
bin/rails generate scaffold Product \
 title:string description:text image_url:string price:decimal  鷹架 build controller,model,view,unit test code


bin/rails db:create     建立DB
(bin/rails|rake) db:migrate    建立資料表
bin/rails db:seed       喂測試資料
bin/rails db:rollback   
bin/rails server        啟動test網站

bin/rails test          整體單元測試
bin/rails test:models   測試model


bundle install  安裝gem
bin/rails webpacker:install
yarn install
bin/rails webpacker:install:react

Gem list (order by important)

aasm : State machines for Ruby classes (plain Ruby, ActiveRecord, Mongoid)
active_hash : ActiveHash is a simple base class that allows you to use a ruby hash as a readonly datasource for an ActiveRecord-like model.
bootstrap : The most popular HTML, CSS, and JavaScript framework for developing responsive
bulk_insert : Faster inserts! Insert N records in a single statement.
capistrano : Capistrano is a utility and framework for executing commands in parallel on multiple remote machines, via SSH. (部署用)
- capistrano-rails
- capistrano-passenger
- capistrano-rvm
- capistrano-slackify
carrierwave : Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends.**
cells-erb : Tilt binding for Erbse. Erbse is a modern Erubis implementation with block support.
cells-rails : Convenient Rails support for Cells.
country_select : Provides a simple helper to get an HTML select list of countries.
devise : Devise is a flexible authentication solution for Rails based on Warden
dry-types : Type system for Ruby supporting coercions, constraints and complex types like structs
faraday : Simple, but flexible HTTP client library, with support for multiple backends.
fog-aws : This library can be used as a module for fog or as standalone provider to use the Amazon Web Services in applications
htmlentities : A module for encoding and decoding (X)HTML entities.
httparty : Makes http fun! Also, makes consuming restful web services dead easy.
json-schema : Ruby JSON Schema Validator
kaminari : Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 4+
letter_opener : Preview mail in the browser instead of sending.
mini_magick : Manipulate images with minimal use of memory via ImageMagick / GraphicsMagick
paper_trail : Track changes to your models' data. Good for auditing or versioning.
paypal-sdk-adaptiveaccounts :
paypal-sdk-rest :
rspec-rails : a testing framework
react-rails :
redis-rails :
rubrowser : a visualizer for ruby code
seed-fu : Advanced seed data handling for Rails
sentry-raven :
settingslogic : A simple and straightforward settings solution that uses an ERB enabled YAML file and a singleton design pattern.
sidekiq-bus : A simple event bus on top of Sidekiq. Publish and subscribe to events as they occur through a queue
simple_form : Forms made easy!
stripe : Stripe is the easiest way to accept payments online. See https://stripe.com for details. API Docuemtn: https://stripe.com/docs/api/ruby#intro
stripe_event : Stripe webhook integration for Rails applications. See: https://github.com/integrallis/stripe_event
trailblazer : A high-level architecture for Ruby introducing new abstractions such as operations, form objects or policies.
- trailblazer-cells
- trailblazer-rails
vanity : is an Experiment Driven Development framework for Rails.
whenever : Clean ruby syntax for writing and deploying cron jobs.
pg : postgresql
puma : A Ruby Web Server Built For Concurrency
breakpoint :
tzinfo-data :

Rspec

https://relishapp.com/rspec/rspec-core/v/3-7/docs/example-groups/basic-structure-describe-it

Factory-girl

http://www.rubydoc.info/gems/factory_bot/file/GETTING_STARTED.md https://github.com/thoughtbot/factory_bot GitHub http://www.rubydoc.info/gems/factory_bot/file/GETTING_STARTED.md Getting Started http://rubyist.marsz.tw/blog/2012-02-06/factory-girl-rails-intro/

Trailblazer

Trailblazer 的目的是將原先 Rails 單純 MVC 架構下可能會散亂在 Controller / Model 層的商業邏輯，集中起來包在 Operation 的概念裡，（在理想狀況下）分別簡化日益肥大的 Controller / Model / View 邏輯：

    Controller
        讓 controller 單純負責傳送 current_user / resource 到正確的 operation 並視操作結果導向相對應的路由
        權限控管交給 Policy 處理，用 controller 塞給 operation 的 current_user 配合 operation 的 model!(param) method 所傳回之 resource 兩者之間的關係去做權限控管
        商業邏輯封裝在 Operation 裡
        只傳送成功執行 operation 後的 @model (resource) 給 view

    Model
        讓 Model 單純負責與資料庫之間的溝通，原先的 Validation 改由 Contract 操作
        本來可能塞在 Model 裡的各種 before_validation before_save 等 callbacks 拉出來改在 operation 的 process 裡面操作
        本來塞在 "fat model" 裡的商業邏輯，一樣抽出來寫在相對應的 operation 裡

    View
        減少原先直接吃 controller instance variables 並在 erb 或 global helper 裡面塞各種邏輯判斷的情況，把 controller 傳過來的 @model 傳到相對應的 Cell 裡面去處理。
        Cell 結合 Reform 可以做出複雜的 form 格式，由於已經透過抽象化，所以複雜 form 的參數不再直接對應到 Model 上，而是綁在 contract attribute 上，屬性的自由度可以大幅增加，透過 prepopulator 去準備需要呈現的 @contract，餵進 controller 的參數也可以透過 populator 做處理，讓 Cell 可以用 form_for 的方式去打包 contract 以簡化 view code

keywords

class: class
attr_accessor :variable_name : 變數get、set (attr_reader , attr_writer)
INSTANCECLASS.instance_methods : 反射class實例method
self.methods : 反射class實例method
def: function define
initialize: class初始化
if ... elsif ... else ... end
$! #表示异常信息
$@ #表示异常出现的代码位置
def self.methodname() : 類方法
private :methodName : private方法
protected :methodName : protected方法
INSTANCECLASS.freeze : 凍結 (有解凍的吧？)
CLASS_NAME.new vs CLASS_NAME.allocate : allocate 不調用initialize
OpenStruck, Struck : http://motion-express.com/blog/20150406-ruby-struct-and-ostruct, http://railsfun.tw/t/method-block-yield-proc-lambda/110
.ancestors 列出祖先class
.included_modules
&. http://mitrev.net/ruby/2015/11/13/the-operator-in-ruby/

ActiveRecord

官方API https://apidock.com/rails/v4.0.2/ActiveRecord/Relation/find_or_create_by

CMD

rails g model event name:string description:text is_public:boolean capacity:integer
rails g migration migration_name (ex: create_{table_name} or add_{column_name}_to_{table_name}, remove_{column}_from_{table_name})

rake db:reset (total schema rebuild)
rake db:migrate 執行Migration動作
rake db:rollback STEP=n 回復上N個 Migration 動作
rake db:migrate:status 顯示目前 migrations 執行的情況

rake db:create 依照目前的 RAILS_ENV 環境建立資料庫
rake db:create:all 建立所有環境的資料庫
rake db:drop 依照目前的 RAILS_ENV 環境刪除資料庫
rake db:drop:all 刪除所有環境的資料庫
rake db:migrate:up VERSION=20080906120000 執行特定版本的Migration
rake db:migrate:down VERSION=20080906120000 回復特定版本的Migration
rake db:migrate:redo
rake db:seed 執行 db/seeds.rb 載入種子資料
rake db:version 目前資料庫的Migration版本

如果需要指定Rails環境，例如production，可以輸入 RAILS_ENV=production rake db:migrate

migration :bulk  
https://aaronlasseigne.com/2012/06/05/faster-activerecord-migrations-using-change-table-bulk/

RELATION

migrate:
  polymorphic: ( t.references :userable, polymorphic: true, index: true )
  references: ( t.references :organization )
  default: ( t.integer :role, default: 3 )
  t.timestamps

models:
  has_many: ( has_many :organizationships, as: :userable, class_name: '::User::Organizationship', dependent: :destroy )
  enum: ( enum role: { admin: 0, editor: 1, project_manager: 2, basic_user: 3 } )
  belongs_to: 
    ( belongs_to :userable, polymorphic: true )
    ( belongs_to :organization, class_name: '::User::Organization' )

READ

{model_name}.find( {id} )
{model_name}.where( where column condition... )

CREATE

{model_name}.new( column datas... )  建立資料，需要 .save

{model_name}.{has_many_model_name}.build( column datas... )  建立資料，需要 .save
{model_name}.build_{has_one_model_name}( column datas... )  
{model_name}.{has_many_model_name}.create( {id} )  直接建立資料並存檔
{model_name}.create_{has_one_model_name}( column datas... )   TODO?:重覆建時 會有dirty資料
{model_name}.{has_many_model_name} << {has_many_model} 建立關鏈

UPDATE

update_all(author: 'David')

DELETE

{model_name}.{has_many_model_name}.destroy_all  # 一筆一筆刪除 e 的 attendee，並觸發 attendee 的 destroy 回呼 (!!真的從資料表中刪除)
{model_name}.{has_many_model_name}.delete  #一次砍掉 e 的所有 attendees，不會觸發個別 attendee 的 destroy 回呼 (!!只update關鍵欄位值為null)

About class

Include, Extend, Load, Require 使用區 https://ruby-china.org/topics/25706

.irbrc

#record irb console command to log file
Kernel.at_exit {
  File.open("irb.log", "a") do |f|
    f << "\n#{Time.now.to_s}\n"
    f << Readline::HISTORY.to_a.join("\n")
  end
}

GC

https://ruby-china.org/topics/27057

Ruby

Ruby

study resource

ruby syntax style

ROR install

疑問

rails 常用指令

Gem list (order by important)

Rspec

Factory-girl

Trailblazer

keywords

ActiveRecord

CMD

RELATION

READ

CREATE

UPDATE

DELETE

About class

.irbrc

GC

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