`dirname'：无法将 nil 转换为字符串（类型错误）
我不确定这是否真的是黄瓜，但以防万一你们中的一些人知道如何解决这个问题。基本上，我的测试突然停止工作，当我检查时，它显示了这个错误：
C:/Vendor/Ruby187/lib/ruby/gems/1.8/gems/cucumber-rails-1.0.0/lib/cucumber/rails3.rb:3 in 'dirname': can't convert nil into String (TypeError)
是的，我首先翻了个白眼，只是咒骂 Windows，但我在 Mac 上尝试了它，得到了相同的结果：
/Users/eumir/.rvm/gems/ruby-1.8.7-p174@mygemset/gems/cucumber-rails-0.5.2/lib/cucumber/rails3.rb:3:in `dirname': can't convert nil into String (TypeError)
不过很奇怪，它有不同的 Cucumber Rails 版本，我用谷歌搜索，第一个结果显示这是bunder的错（虽然我无法破译要点是什么......也许只是复制粘贴的东西？）最奇怪的是，Cucumber正在运行，我在运行时遇到了这个问题rspec 规范。
下面的3条线索指出这不是黄瓜的错，但它为什么要怪黄瓜呢？如果你们中的任何一个人能提供有关为什么会发生这种情况的线索，那么您将让我免于再遭受几个小时的痛苦。
I'm not sure if this is in cucumber really, but just in case some of you guys have a clue on how to fix this. Basically, my tests suddenly stopped working and when I checked, it showed this error:
C:/Vendor/Ruby187/lib/ruby/gems/1.8/gems/cucumber-rails-1.0.0/lib/cucumber/rails3.rb:3 in 'dirname': can't convert nil into String (TypeError)
Yes, I first rolled my eyes and just cursed Windows but I tried it on my Mac and I got the same:
/Users/eumir/.rvm/gems/ruby-1.8.7-p174@mygemset/gems/cucumber-rails-0.5.2/lib/cucumber/rails3.rb:3:in `dirname': can't convert nil into String (TypeError)
Weird though, its in different cucumber rails versions, I googled and the first result shows it is bunder's fault(although I can't decipher what the gist is about...maybe just copy pasted stuff?) and weirdest of all, Cucumber IS running and I run into this problem while running rspec spec.
The 3 clues below point out that it's not cucumber's fault, but why does it blame cucumber? IF any of you can shed a clue as to why this is happening, you'll be saving me from a few more hours of pain.
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这是由捆绑程序尝试“自动需要”gem 造成的。在 1.0 中，bundler 会尝试 gem 名称（在本例中为“cucumber-rails”），如果找不到文件（实际上没有找到），则会消除错误。
在捆绑器 1.1.1 中，捆绑器将“-”实例替换为“/”，导致它自动需要“cucumber/rails”，从而导致 Ewout 描述的“意外”加载。
要解决此问题，请设置
:require =>; false在你的 gemfile 中。（注意：
:require => false并不意味着 gem 是可选的，只是 Bundler 不应该自动需要它）This was caused by how bundler attempts to "autorequire" gems. In 1.0, bundler tries the gem name (in this case "cucumber-rails") and smothers the error if the file isn't found (it isn't).
In bundler 1.1.1, bundler replaces instances of "-" with "/", resulting in it autorequiring "cucumber/rails" which results in the "accidental" loading described by Ewout.
To resolve, set
:require => falsein your gemfile.(Note:
:require => falsedoesn't mean that the gem is optional, just that Bundler shouldn't auto-require it)新的 Cucumber-rails 版本会警告您此问题。 Cucumber-rails 应该从 env.rb 文件中获取，而不是在之前由捆绑程序获取。为此，请将
gem cucumber-rails行放入 Gemfile 中的 :test 组中。New cucumber-rails versions warn you about this problem. Cucumber-rails should be required from the env.rb file, and not before by bundler. To achieve that, put the
gem cucumber-railsline in the group :test within your Gemfile.正如阿斯拉克在他的回复中所说：
http://groups.google.com/group/cukes/ msg/803836e9f6e7f1be
我只需要升级 cucumber-rails。 @Ewout 也给我指出了正确的方向，所以他也应该得到 +1 :)
As aslak says in his reply:
http://groups.google.com/group/cukes/msg/803836e9f6e7f1be
I just needed to upgrade cucumber-rails. @Ewout did point me in the right direction too so he also deserves a +1 :)