Rails 功能失调，需要机架 1.3.5，有 1.4.0 但无法安装 1.3.5

Question

$ rails

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:777:in `report_activate_error': RubyGem version error: rack(1.4.0 not ~> 1.3.5) (Gem::LoadError)
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:211:in `activate'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
            from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:1056:in `gem'
            from /usr/bin/rails:18

然后我尝试这个：

$ sudo gem installrack 1.3.5

密码：

成功安装rack-1.4.0

错误：无法在本地或存储库中找到gem 1.3.5

1 gem安装

正在安装rack-1.4.0的ri文档.. ；

无法读取 termcap 数据库

使用哑终端设置。

正在安装rack-1.4.0的RDoc文档...

然后又不同了：

rails
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:230:in `activate': can't activate rack (~> 1.3.5, runtime) for ["actionpack-3.1.3", "rails-3.1.3"], already activated rack-1.4.0 for ["rack-cache-1.1", "actionpack-3.1.3", "rails-3.1.3"] (Gem::LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:1056:in `gem'
    from /usr/bin/rails:18

Answer 1

您必须安装机架 1.3.5 并删除机架 1.4.0

sudo gem install rack -v 1.3.5
sudo gem uninstall rack -v 1.4.0

Answer 2

安装特定版本的命令是

sudo gem install rack --version=1.3.5

您编写的内容是试图找到一个名为 1.3.5 的 gem

Answer 3

我相信这是因为机架宝石版本。

给出命令gem listrack

它会显示所有rack gems版本，之后我卸载了所有rack版本并运行bundle命令希望您在Gemfile中指定了您想要的rack版本。

我相信这是因为如果您在 Gemfile 中指定机架版本，并且如果 gems 跟踪的版本大于该版本，则会导致错误。

因此，尝试卸载所有机架宝石并运行捆绑命令。

希望它能有所帮助。