ruby：irb给NameError试图使用机械化宝石（ubuntu） [英] ruby: irb gives NameError attempting to use mechanize gem (ubuntu)

问题描述

在我的Ubuntu机器上，当我尝试使用机械化宝石时，irb（ruby）给出了一个NameError：

On my ubuntu box, irb (ruby) gives a NameError when I try to use the mechanize gem:

$ 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：

gem env shows this:

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/

宝石列表显示它已安装：

gem list shows it's installed:

$ gem list mech
*** LOCAL GEMS ***
mechanize (1.0.0)

它在文件系统中的两个路径：

it's in both paths in the filesystem:

$ 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：

RubyGems is up to date:

$ 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：

I have an up-to-date ruby:

ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]

以下是我所拥有的ubuntu gems软件包（注意我安装了rubyge

Here's what ubuntu gems packages I have (note that I installed rubygems-update and ran 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

推荐答案

尝试使用

try to create the class using

WWW::Mechanize.new

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