ruby-on-rails - 在 OSX 上安装 Mysql gem 错误 - 'Marshal data too short'

Question

尝试在 OSX 上安装 mysql gem 时出现“编码(marshal)数据太短”错误。四处闲逛，我听说过清除 .gems 的建议，但似乎无法在系统上找到它。任何人都可以提供帮助吗？

apple$ sudo gem install mysql --backtrace --debug
Exception `NameError' at /Library/Ruby/Site/1.8/rubygems/command_manager.rb:161 - uninitialized constant Gem::Commands::InstallCommand
Exception `Gem::LoadError' at /Library/Ruby/Site/1.8/rubygems.rb:826 - Could not find RubyGem test-unit (>= 0)

Exception `ArgumentError' at /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:111 - marshal data too short
ERROR:  While executing gem ... (ArgumentError)
    marshal data too short
    /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:111:in `load'
    /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:111:in `fetch_spec'
    /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:71:in `fetch'
    /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:70:in `map'
    /Library/Ruby/Site/1.8/rubygems/spec_fetcher.rb:70:in `fetch'
    /Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:99:in `find_gems_with_sources'
    /Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:192:in `find_spec_by_name_and_version'
    /Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:213:in `install'
    /Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:118:in `execute'
    /Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:115:in `each'
    /Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:115:in `execute'
    /Library/Ruby/Site/1.8/rubygems/command.rb:257:in `invoke'
    /Library/Ruby/Site/1.8/rubygems/command_manager.rb:132:in `process_args'
    /Library/Ruby/Site/1.8/rubygems/command_manager.rb:102:in `run'
    /Library/Ruby/Site/1.8/rubygems/gem_runner.rb:58:in `run'
    /usr/bin/gem:21

Answer 1

如果我要使用 gem，我在 Windows 机器上遇到了同样的错误。

ERROR:  While executing gem ... (ArgumentError)    
marshal data too short

删除 gem 缓存目录“c:\Documents and Settings\MyUser\.gem”对我有用。
即使您重新安装ruby，似乎也保存了一些数据。可能是缓存文件已损坏。