宝石在irb中加载，但不在控制台中

问题描述

这使我发疯。我可以通过irb加载宝石：

This one is driving me nuts. I can load a gem via irb:

steve@server:/var/www/listings$ irb
irb(main):001:0> Gem.path
=> ["/home/steve/.gem/ruby/1.9.1", "/usr/local/ruby/lib/ruby/gems/1.9.1"]
irb(main):002:0> require 'nokogiri'
=> true

但是我无法通过Rails控制台加载它：

But I can't load it through the rails console:

irb(main):001:0> Gem.path
=> ["/home/steve/.gem/ruby/1.9.1", "/usr/local/ruby/lib/ruby/gems/1.9.1"]
irb(main):002:0> require 'nokogiri'
=> false

已安装gem（nokogiri）

The gem (nokogiri) is installed

steve@server:/var/www/listings$ gem which nokogiri
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/nokogiri-1.4.3.1/lib/nokogiri.rb

并且捆绑包同意

steve@server:/var/www/listings$ bundle show nokogiri
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/nokogiri-1.4.3.1

但是，当然，耙规格会因

But, of course, rake spec fails with

/usr/local/ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:304:in `rescue in depend_on': No such file to load -- Nokogiri (LoadError)

其他环境信息：

steve@server:/var/www/listings$ ruby --version
ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux]
steve@server:/var/www/listings$ rails --version
Rails 3.0.1
steve@server:/var/www/listings$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.3.7
  - RUBY VERSION: 1.9.2 (2010-08-18 patchlevel 0) [i686-linux]
  - INSTALLATION DIRECTORY: /usr/local/ruby/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /usr/local/ruby/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/ruby/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-linux
  - GEM PATHS:
     - /usr/local/ruby/lib/ruby/gems/1.9.1
     - /home/steve/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

任何建议？

编辑

顺便说一句，Nokogiri在Gemfile和捆绑软件安装完成，没有任何投诉。

By the way, Nokogiri is in the Gemfile and bundle install completes without complaint.

这是我正在从Windows迁移到Ubuntu的一个项目。在Windows上，它工作正常（非常好！），所以我很确定这是环境问题。

This is a project I'm moving from windows to Ubuntu. On windows it's working fine (oddly enough!) so I'm pretty sure it's an environment thing.

推荐答案

require如果返回false该文件已被加载。通过连续两次执行require语句，在irb会话中进行尝试。第二个将返回false：

require returns false if that file has already been loaded. Try it out in your irb session by performing the require statement twice in a row. The second one will return false:

irb(main):001:0> require 'nokogiri'
=> true
irb(main):002:0> require 'nokogiri'
=> false

如果找不到文件，则require将引发LoadError。

If the file could not be found, require will raise a LoadError instead.

您的异常消息（没有要加载的文件-Nokogiri），似乎是在需要 Nokogiri而不是 nokogiri，这可能是一个问题在区分大小写的操作系统上。

Your exception message (No such file to load -- Nokogiri), makes it seem like something is requiring 'Nokogiri' instead of 'nokogiri', which might be a problem on a case-sensitive operating system.

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