0
我们有一个rake任务，在数据库系统之间运行一个复杂的转换。我们已经升级了这个任务，现在需要Nokogiri。它的安装：无法运行需要'nokogiri'的耙式任务
`gem list --local`:
*** LOCAL GEMS ***
...
nokogiri (1.5.9)
...
Ruby是在1.8.x的版本，需要require 'rubygems'：
`ruby -v`
ruby 1.8.7 (2012-02-08 MBARI 8/0x8770 on patchlevel 358) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2012.02
随着IRB，一切似乎很动听：
`irb`
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'nokogiri'
=> true
irb(main):003:0>
但是，在开始rake任务，它似乎没有找到nokogiri：
lib/tasks$ RAILS_ENV="test" rake redmine::migrate_from_buggy_new.rake 280 --trace
(in /var/www/redmine)
rake aborted!
no such file to load -- nokogiri
/var/www/redmine/lib/tasks/migrate_from_buggy_new.rake:27:in `require'
/var/www/redmine/lib/tasks/migrate_from_buggy_new.rake:27
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/engine.rb:425:in `load'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/engine.rb:425:in `load_tasks'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/engine.rb:425:in `each'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/engine.rb:425:in `load_tasks'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/application.rb:145:in `load_tasks'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/railtie/configurable.rb:30:in `send'
/usr/local/lib/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/railtie/configurable.rb:30:in `method_missing'
/var/www/redmine/Rakefile:7
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load_rakefile'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:583:in `raw_load_rakefile'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:89:in `load_rakefile'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:88:in `load_rakefile'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:72:in `run'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:70:in `run'
/usr/local/lib/ruby/gems/1.8/gems/rake-10.0.3/bin/rake:33
/usr/local/bin/rake:19:in `load'
/usr/local/bin/rake:19
我不确定接下来该做什么，我在Ruby环境中很新鲜，而且一切都还是陌生而新鲜的。
编辑：耙文件的开头是这样的：
require 'active_record'
require 'action_controller'
require 'iconv'
require 'pp'
require 'rubygems'
require 'nokogiri'
namespace :redmine do
desc 'Buggy migration script'
task :migrate_from_buggy => :environment do
编辑2：引入nokogiri安装到/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.5.9/lib/nokogiri。我试图将其包含到搜索路径中，如下所示：
RAILS_ENV="test" rake redmine::migrate_from_buggy_new.rake 280 -I "/usr/local/lib/ruby/gems/1.8/gems/"
RAILS_ENV="test" rake redmine::migrate_from_buggy_new.rake 280 -I "/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.5.9"
RAILS_ENV="test" rake redmine::migrate_from_buggy_new.rake 280 -I "/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.5.9/lib"
RAILS_ENV="test" rake redmine::migrate_from_buggy_new.rake 280 -I "/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.5.9/lib/nokogiri"
所有无效（同样的问题/错误消息）。
耙子任务是什么样的？你需要“rubygems”吗？ –
用rake文件的开头更新了这个问题，但我并没有真正看到它的意义。 – 0xCAFEBABE
如果您需要'需要'rubygems''，它必须发生在宝石需求清单的顶部，而不是中途。 Ruby 1.8.7是第一个不需要你需要红宝石的地方;尝试启动irb并输入'require'rubygems''，你应该看到一个'false'结果，意味着它已经被加载。这不会解决问题，但会消除一些混乱。 –