Ruby Require

by 吕小荣

Transcript

1. Ruby require 吕⼩小荣
2. 医⽣生 产品狗 程序员 @xiaoronglv
3. 2.1.5 > require 'json' => true 2.1.5 > JSON.parse "{\"a\":1}" => {"a"=>1}
4. ⽅方法？关键字？
5. where？
6. 咖啡机
7. > require 'coffee_machine'
8. $LOAD_PATH
9. 拼接 /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb > require 'coffee_machine'
10. 失败
11. 添加 $LOAD_PATH
12. /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb > require 'coffee_machine' => true
13. $LOADED_FEATURES
14. $LOADED_FEATURES > puts $LOADED_FEATURES ... ..... /…/…coffee_machine.rb • 全局变量 • 数组 • 已经require过的⽂文件 • 绝对地址（？） • 第⼆二次 require 时，直接 false
16. ⼆二
18. require 'active_support'
19. /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb require 'active_support' => it should raise LoadError, right?
20. require 'active_support' => true
21. RubyGems RubyGems was created in about November 2003 and is now part of the standard library from Ruby version 1.9.
22. 覆盖 require • load from the existing Ruby load path • activate gem
23. activate gem
24. 1.9.3 > spec = Gem::Specification.find_by_path('active_support') => #<Gem::Specification:0x80442624 activesupport-4.1.4> 1.9.3-p547 :005 > spec.activate => true active gem
25. Vs
27. Bundler 如何 require 它的 gems？ 三
28. Gemfile
29. Gemfile
30. $LOAD_PATH
31. $LOAD_PATH > require 'bundler/setup' => true
32. $LOAD_PATH
33. 将 Gemfile.lock 中的 所有gem 添加到 $LOAD_PATH中
34. Bundler.require(:default, development)
35. 四 Rails 如何使⽤用 bundler require 它的 gems？
36. config.ru
37. enviroment.rb
38. application.rb
39. boot.rb
40. Learning • 与⼤大⽜牛 Pair • 参与多元项⺫⽬目
41. Thanks