InstantRails-2.0中的rails升级

一、InstantRails-2.0安装后，在配置环境变量path中配置ruby/bin目录（若是系统中有多个RUBY，执行命令行的时候系统认的就是path中的）

二、进入DOS命令行，执行gem update --system，结果

Updating RubyGems...
ERROR:  While executing gem ... (Gem::RemoteSourceException)
HTTP Response 302 fetching http://rubygems.org/yaml

     这是由于gem的配置太低，没法进行远程更新，执行gem -v 发现是1.0.1

三、从下面这个地址下载 rubygems-update-1.3.7.gem，http://rubyforge.org/frs/download.php/70695/rubygems-update-1.3.7.gem

    而后DOS命令进行该文件所在的目录，执行gem install --local rubygems-update-1.3.7.gem，出现信息

Successfully installed rubygems-update-1.3.7
1 gem installed
Installing ri documentation for rubygems-update-1.3.7...
Installing RDoc documentation for rubygems-update-1.3.7...
Could not find main page README
Could not find main page README
Could not find main page README
Could not find main page README

四、执行update_rubygems，再执行gem -v，发现更新成功；

五、执行gem install rack -v=1.0.0

Successfully installed rack-1.0.0
1 gem installed
Installing ri documentation for rack-1.0.0...
Installing RDoc documentation for rack-1.0.0...

更新成功

六、再次执行 gem update rails --include-dependencies

出现信息

Updating installed gems
Updating rails
Successfully installed rake-0.8.7
Successfully installed activesupport-2.3.8
Successfully installed activerecord-2.3.8
Successfully installed rack-1.1.0
Successfully installed actionpack-2.3.8
Successfully installed actionmailer-2.3.8
Successfully installed activeresource-2.3.8
Successfully installed rails-2.3.8
Gems updated: rake, activesupport, activerecord, rack, actionpack, actionmailer, activeresource, rails
Installing ri documentation for rake-0.8.7...
Installing ri documentation for activesupport-2.3.8...
Installing ri documentation for activerecord-2.3.8...
Installing ri documentation for rack-1.1.0...
Installing ri documentation for actionpack-2.3.8...
Installing ri documentation for actionmailer-2.3.8...
Installing ri documentation for activeresource-2.3.8...
Installing ri documentation for rails-2.3.8...
Installing RDoc documentation for rake-0.8.7...
Installing RDoc documentation for activesupport-2.3.8...
Installing RDoc documentation for activerecord-2.3.8...
Installing RDoc documentation for rack-1.1.0...
Installing RDoc documentation for actionpack-2.3.8...
Installing RDoc documentation for actionmailer-2.3.8...
Installing RDoc documentation for activeresource-2.3.8...
Installing RDoc documentation for rails-2.3.8...

执行rails -v，发现已更新成功

注：执行第6步时，有时会不成功，能够到http://www.garbagecollect.jp/ruby/mswin32/ja/download/release.html处下载ruby-1.8.7-p249-i386-mswin32.zip，而后解到InstantRails-2.0-win\ruby下，执行 gem install -v=2.3.2 rails就能够更新成功了(此法由houjzhong 提供，在此致谢！)

总结：

rails更新有两种方式：一、联机更新;2本地更新

联机更新过程当中若是出现HTTP Response 302 fetching http://rubygems.org/yaml没法更新，有两种状况

一是gem的版本太低，二是与服务器的链接不通

此时能够试着加入其余服务器地址

 gem source -l  查看列表

 gem source -a http://rubygems.org 加入新的服务器地址

 或者直接gem install rubygems-update --source http://rubygems.org

本地更新须要下载相应的gem包，版本需与要更新的rails版本对应，同时安装顺序有要求，所以gem包之间有依赖关系

顺序从上面的显示信息中能够看出来

Successfully installed rake-0.8.7
Successfully installed activesupport-2.3.8
Successfully installed activerecord-2.3.8
Successfully installed rack-1.1.0
Successfully installed actionpack-2.3.8
Successfully installed actionmailer-2.3.8
Successfully installed activeresource-2.3.8
Successfully installed rails-2.3.8

至于gem包的下载地址都在http://rubyforge.org/，可是有些项目的并很差找到，能够在google中直接搜索，就能找到在http://rubyforge.org/中的地址。