ruby gem tips(轉)

淘寶源：

https://ruby.taobao.org

升級ruby gem 

gem update --system

查看gem版本 

gem -v

查看gem版本，gems安裝目錄，remote sources等 

gem env

查看已經添加的remote sources 

gem sources

添加一個source 

gem sources -a 'https://rubygems.org'

刪除一個source

gem sources --remove 'https://rubygems.org'

安裝一個gem包 

gem install will_paginate

指定源位置 

gem install will_paginate --source 'http://rubygems.org'
gem install will_paginate -s 'http://rubygems.org'

指定版本 

gem install rails -v=2.3.5

查看已經安裝的所有gem包 

gem list

或者 gem list -d 查看具體的信息，例如project的author，homepage，安裝在系統中的路徑 等信息，建議加上該參數… 
查看d開頭的gem包 

gem list d

更詳細的查看 

gem list will_paginate -d

卸載gem包 

gem uninstall rails

卸載指定版本 

gem uninstall rails -v=2.1.0

查找gem包 

gem search will_paginate --both (在local和remote源中search含有will_paginate關鍵字的)
gem list -r will_paginate
gem list -dr will_paginate (我經常使用這個)

查看gem包依賴其餘的gem： 

gem dependency rails -v 2.3.5
Gem rails-2.3.5
  actionmailer (= 2.3.5, runtime)
  actionpack (= 2.3.5, runtime)
  activerecord (= 2.3.5, runtime)
  activeresource (= 2.3.5, runtime)
  activesupport (= 2.3.5, runtime)
  rake (>= 0.8.3, runtime)

查看gem包的rdoc幫助 

gem server (而後http://localhost:8808查看)

windows 平臺上安裝 

gem install hpricot --platform=mswin32 # 不指定在windows安裝會報錯

不安裝ri 和 rdoc 

gem install hpricot --no-ri --no-rdoc

查看更多的gem幫助，能夠 

gem -h

項目裏經常使用gem命令 

rake -T gems:
(in /usr/local/system/entos/netposa_redmine)
rake gems:build                # Build any native extensions for unpacked gems
rake gems:build:force          # Force the build of all gems
rake gems:install              # Installs all required gems.
rake gems:refresh_specs        # Regenerate gem specifications in correct format.
rake gems:unpack               # Unpacks all required gems into vendor/gems.
rake gems:unpack:dependencies  # Unpacks all required gems and their dependencies into vendor/gems.

例如你enviroment.rb 中配置了paperclip gem 

config.gem 'paperclip', '2.3.5'

那麼 

rake gems:install

將會安裝paperclip 2.3.5 到你的ruby目錄裏, 

rake gems:unpack:dependencies

將會把依賴的gem包unpack 到vendor/gems 目錄下, 
若是你是直接從gem包copy 到vendor/gems 目錄下的話,須要執行 

rake gems:refresh_specs

來生成 .specifications 文件 

 

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gem安裝mysql包

1.安裝依賴：

yum install -y ruby-devel mysql mysql-devel gcc make

2.gem安裝mysql包(國內建議替換gem源爲淘寶源)

gem install mysql