Articles

• database commond

  May 18, 2013

  PostgreSQL

  create user

  CREATE USER davide WITH PASSWORD 'jw8s0F4';

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• ssh公開鍵権限設定

  May 17, 2013

  client

  cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
  chmod 700 ~/.ssh
  chmod 600 ~/.ssh/authorized_keys

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• Linux 環境変数メモ

  Feb 23, 2013

  bash

  .bash_profileは、ログイン時だけに実行される設定ファイルだ。ここでは、環境変数の設定などが行われる（内容はディストリビューションによって異なる）。

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• rspec rails

  Feb 5, 2013

  $ echo 'gem "rspec-rails", :group => [:development, :test]' >> Gemfile
  $ rails generate rspec:install
  //test
  $ rake spec
  $ rails generate scaffold Widgets name:string
        invoke    rspec
        create      spec/models/widget_spec.rb
        invoke    rspec
        create      spec/controllers/widgets_controller_spec.rb
        create      spec/views/widgets/edit.html.erb_spec.rb
        create      spec/views/widgets/index.html.erb_spec.rb
        create      spec/views/widgets/new.html.erb_spec.rb
        create      spec/views/widgets/show.html.erb_spec.rb
        create      spec/routing/widgets_routing_spec.rb
        invoke      rspec
        create        spec/requests/widgets_spec.rb
        invoke      rspec
        create        spec/helpers/widgets_helper_spec.rb
  $ rails g model widge
        invoke    rspec
        create      spec/models/widge_spec.rb
        create      app/assets/stylesheets/mycontroller.css.scss
  $ rails g controller widget
        invoke  rspec
        create    spec/controllers/widget_controller_spec.rb
        invoke    rspec
        create      spec/helpers/widget_helper_spec.rb
  $ rails g integration_test widget
        invoke  rspec
        create    spec/requests/widgets_spec.rb
  $ rails generate scaffold_controller Foos
        invoke  rspec
        create    spec/controllers/foos_controller_spec.rb
        create    spec/views/foos/edit.html.erb_spec.rb
        create    spec/views/foos/index.html.erb_spec.rb
        create    spec/views/foos/new.html.erb_spec.rb
        create    spec/views/foos/show.html.erb_spec.rb
        create    spec/routing/foos_routing_spec.rb
        invoke    rspec
        create      spec/requests/foos_spec.rb
        invoke  helper
        create    app/helpers/foos_helper.rb
        invoke    rspec
        create      spec/helpers/foos_helper_spec.rb

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• Metaprogramming Ruby

  Dec 9, 2012

  第一章，object model

  class与module

  1. class是object，class name是定数。object的instance value住在object里面，object的method住在class里面。
  2. class只是一个拥有allocate, new, superclass这三个函数的module。那么什么时候用class，什么时候用module呢？一般当要被include的时候用module（或者当作namespace使用的时候），要生成或者继承的时候使用class。

  String.instance_methods == 'abc'.methods # => true
  Class.instance_methods(false)            # => [:allocate, :new, :superclass]
  # class
  'hello'.class # => String
  String.class  # => Class
  Class.class   #=> Class
  # superclass
  Myclass.superclass        # => Object
  String.superclass         # => Object
  Class.superclass          # => Module
  Module.superclass         # => Object
  Object.superclass         # => BasicObject
  BasicObject.superclass    # => nil

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