ruby：irb给NameError尝试使用mechanize gem（ubuntu）
在我的ubuntu框中，当我尝试使用mechanize gem时，irb（ruby）给出一个NameError：
$ irb irb(main):001:0> require 'mechanize' => true irb(main):002:0> Mechanize.new NameError: uninitialized constant Mechanize from (irb):2 from :0 gem env显示了这个：
RubyGems Environment: - RUBYGEMS VERSION: 1.3.7 - RUBY VERSION: 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux] - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8 - RUBY EXECUTABLE: /usr/bin/ruby1.8 - EXECUTABLE DIRECTORY: /usr/bin - RUBYGEMS PLATFORMS: - ruby - x86_64-linux - GEM PATHS: - /usr/lib/ruby/gems/1.8 - /var/lib/gems/1.8 - GEM CONFIGURATION: - :update_sources => true - :verbose => true - :benchmark => false - :backtrace => false - :bulk_threshold => 1000 - :gempath => ["/var/lib/gems/1.8", "/usr/lib/ruby/gems/1.8"] - REMOTE SOURCES: - http://rubygems.org/
gem list显示它已安装：
$ gem list mech *** LOCAL GEMS *** mechanize (1.0.0)
它位于文件系统的两个路径中：
$ ls -1 /var/lib/gems/1.8/gems/ |grep mech mechanize-1.0.0 $ ls -1 /usr/lib/ruby/gems/1.8/gems |grep mech mechanize-1.0.0
RubyGems是最新的：
$ gem update --system Updating RubyGems Nothing to update # gem list rubygems *** LOCAL GEMS *** rubygems-update (1.3.7)
我有一个最新的ruby：
ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]
这是我拥有的ubuntu gems包（注意我安装了rubygems-update并运行了update_rubygems）：
# dpkg -l rubygems* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Description +++-==================-==================-==================================================== ii rubygems 1.3.5-1ubuntu2 package management framework for Ruby libraries/appl ii rubygems-doc 1.3.5-1ubuntu2 package management framework for Ruby libraries/appl ii rubygems1.8 1.3.5-1ubuntu2 package management framework for Ruby libraries/appl
尝试使用创建类
WWW::Mechanize.new