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Ruby require 吕⼩小荣
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医⽣生 产品狗 程序员 @xiaoronglv
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2.1.5 > require 'json' => true 2.1.5 > JSON.parse "{\"a\":1}" => {"a"=>1}
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⽅方法？关键字？
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where？
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咖啡机
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> require 'coffee_machine'
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$LOAD_PATH
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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'
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失败
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添加 $LOAD_PATH
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/coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb /coffee_machine.rb > require 'coffee_machine' => true
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$LOADED_FEATURES
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$LOADED_FEATURES > puts $LOADED_FEATURES ... ..... /…/…coffee_machine.rb • 全局变量 • 数组 • 已经require过的⽂文件 • 绝对地址（？） • 第⼆二次 require 时，直接 false
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⼆二
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require 'active_support'
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/active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb /active_support.rb require 'active_support' => it should raise LoadError, right?
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require 'active_support' => true
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RubyGems RubyGems was created in about November 2003 and is now part of the standard library from Ruby version 1.9.
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覆盖 require • load from the existing Ruby load path • activate gem
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activate gem
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1.9.3 > spec = Gem::Specification.find_by_path('active_support') => # 1.9.3-p547 :005 > spec.activate => true active gem
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Vs
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Bundler 如何 require 它的 gems？ 三
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Gemfile
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Gemfile
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$LOAD_PATH
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$LOAD_PATH > require 'bundler/setup' => true
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$LOAD_PATH
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将 Gemfile.lock 中的 所有gem 添加到 $LOAD_PATH中
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Bundler.require(:default, development)
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四 Rails 如何使⽤用 bundler require 它的 gems？
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config.ru
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enviroment.rb
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application.rb
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boot.rb
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Learning • 与⼤大⽜牛 Pair • 参与多元项⺫⽬目
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Thanks