最新对mac 10.10的强大功能好奇，于是将系统升级到了10.10，结果发现使用pod出现了下面的问题：

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- xcodeproj/prebuilt/universal.x86_64-darwin14-2.0.0/xcodeproj_ext (LoadError)
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj/ext.rb:6:in `rescue in <top (required)>'
 from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj/ext.rb:3:in `<top (required)>'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj.rb:30:in `<top (required)>'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/lib/cocoapods.rb:2:in `<top (required)>'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/bin/pod:32:in `<top (required)>'
 from /usr/bin/pod:23:in `load'
 from /usr/bin/pod:23:in `<main>'

经过一番乱搜，具体的解决步骤如下:
1. 打开 Xcode 6
2. 进入 Preferences
3. 点击Locations选项
4. 将 Command Line Tools 版本变成 Xcode 6.0
5. 卸载 cocoapods，在终端中输入

$ sudo gem uninstall cocoapods 

6. 安装xcodeproj，在终端中输入

$ sudo gem install xcodeproj 

7. 安装cocoapods，在终端中输入

$ sudo gem install cocoapods 

8. 测试pod是否安装成功，在终端中输入

$ pod --version 

win7安装ruby on rails开发环境
前言看到很多文章都说ruby环境在windows上是非常难搭建，会出现各种各样的怪问题，所以都推荐到linux和mac上安装开发。但是我按照教程搭了下，问题也

Ruby实现命令行中查看函数源码的方法
如果要查看ActiveRecord的update_attribute函数的源代码，一个比较常见的方法是直接在Rails源码中搜索defupdate_attribute。博客ThePragmaticStudio介绍了一个更方便的

Ruby中的public、private、protected区别小结
重点关注private与protectedpublic默认即为public，全局都可以访问，这个不解释privateC++,private意为privatetothisclass,但是Ruby中意为privatetothisinstance.意思是：C++中