“要求”水豚/铁轨“”给“未初始化的常量Rack :: Builder”

我一直在我的应用程序中使用黄瓜，这是一个轨道2.2.2应用程序运行在红宝石1.8.6（升级不是选项现在）。黄瓜已经很好了，现在我正在尝试使用水豚。我已经安装了capybara (1.1.1)宝石，并将require 'capybara/rails'放入我的features/support/env.rb file。“要求”水豚/铁轨“”给“未初始化的常量Rack :: Builder”

现在，当我运行黄瓜，我得到这个错误：

Using the default profile... 
uninitialized constant Rack::Builder (NameError) 
/home/max/.rvm/gems/[email protected]/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:445:in `load_missing_constant' 
/home/max/.rvm/gems/[email protected]/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:77:in `const_missing' 
/home/max/.rvm/gems/[email protected]/gems/capybara-1.1.1/lib/capybara/rails.rb:4 
/home/max/.rvm/rubies/ruby-1.8.6-p420/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require' 
/home/max/.rvm/rubies/ruby-1.8.6-p420/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' 
/home/max/.rvm/gems/[email protected]/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:155:in `require' 
/home/max/work/charanga/elearn_container/elearn/features/support/env.rb:10 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/rb_support/rb_language.rb:143:in `load' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/rb_support/rb_language.rb:143:in `load_code_file' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime/support_code.rb:171:in `load_file' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime/support_code.rb:83:in `load_files!' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime/support_code.rb:82:in `each' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime/support_code.rb:82:in `load_files!' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime.rb:137:in `load_step_definitions' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/runtime.rb:39:in `run!' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/cli/main.rb:43:in `execute!' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/../lib/cucumber/cli/main.rb:20:in `execute' 
/home/max/.rvm/gems/[email protected]/gems/cucumber-1.1.1/bin/cucumber:14 
/home/max/.rvm/gems/[email protected]/bin/cucumber:19:in `load' 
/home/max/.rvm/gems/[email protected]/bin/cucumber:19

这里的示数文件：

#/home/max/.rvm/gems/[email protected]/gems/capybara-1.1.1/lib/capybara/rails.rb 
require 'capybara' 
require 'capybara/dsl' 

Capybara.app = Rack::Builder.new do 
    map "/" do 
    if Rails.version.to_f >= 3.0 
     run Rails.application 
    else # Rails 2 
     use Rails::Rack::Static 
     run ActionController::Dispatcher.new 
    end 
    end 
end.to_app 

Capybara.asset_root = Rails.root.join('public') 
Capybara.save_and_open_page_path = Rails.root.join('tmp/capybara')

因此，4号线与Rack::Builder.new线产生错误。但为什么？有任何想法吗？我已经安装了Rack Gem。

谢谢，最大

来源

2012-01-06 Max Williams

有一个类似的问题，只要我添加spec/spec_helper.rb行要求'水豚/钢轨'我得到错误消息'/vendor/rails/activesupport/lib/active_support/dependencies.rb:445：在'load_missing_constant'：未初始化的常量Rack :: Builder（NameError）' – hebe 2012-01-28 13:41:43

Uggrading to 1.8.7不是一个选项，还是1.9/2.0？它可能会解决你的问题。 – fotanus 2013-08-15 21:15:26

您是否使用了黄瓜护栏宝石？

说，既可以使用宝石，或者，如果your're不使用轨道，把这两行：

require 'capybara/cucumber' 
Capybara.app = MyRackApp

来源

2012-03-14 20:13:52

这不是一个黄瓜测试赛跑者，因此这个答案并没有帮助我。 – satyajit 2013-08-09 22:31:24

尝试features/support/env.rb的require 'capybara/rails'前添加require 'rack/builder'。低于2.3的Rails版本不会在内部使用Rack，因此Rack :: Builder不会像capybara似乎假设的那样加载。

来源

2013-08-14 02:29:37 Gray

尝试了这一点

gem install rack 

    require 'rack' # in features/support/env.rb before every require

架::生成器机架库中定义。

来源

2013-08-15 05:32:53

你能否详细说明一下？ – Paul 2013-08-15 05:55:42

@ Rack，Rack :: Builder在机架库中定义。 – 2013-08-17 20:42:56

“要求”水豚/铁轨“”给“未初始化的常量Rack :: Builder”

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