我刚刚升级到ruby 1.9.3-p125（从1.9.3-p0开始）。所有测试在升级之前都有效。现在，在运行rake功能时出现以下错误
Using the default profile...
undefined method `config' for nil:NilClass (NoMethodError)
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-rails-1.3.0/lib/cucumber/rails.rb:17:in `<top (required)>'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler/runtime.rb:74:in `require'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler/runtime.rb:74:in `rescue in block in require'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler/runtime.rb:62:in `block in require'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `each'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `require'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/bundler-1.1.3/lib/bundler.rb:119:in `require'
/home/map7/pais/config/application.rb:7:in `<top (required)>'
/home/map7/pais/config/environment.rb:2:in `require'
/home/map7/pais/config/environment.rb:2:in `<top (required)>'
/home/map7/pais/features/support/env.rb:8:in `require'
/home/map7/pais/features/support/env.rb:8:in `<top (required)>'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/rb_support/rb_language.rb:129:in `load'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/rb_support/rb_language.rb:129:in `load_code_file'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime/support_code.rb:171:in `load_file'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime/support_code.rb:83:in `block in load_files!'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime/support_code.rb:82:in `each'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime/support_code.rb:82:in `load_files!'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime.rb:175:in `load_step_definitions'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/runtime.rb:40:in `run!'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/cli/main.rb:43:in `execute!'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/lib/cucumber/cli/main.rb:20:in `execute'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/gems/cucumber-1.1.9/bin/cucumber:14:in `<top (required)>'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/bin/cucumber:19:in `load'
/home/map7/.rvm/gems/ruby-1.9.3-p194@rails3.2/bin/cucumber:19:in `<main>'
rake aborted!
Command failed with status (1): [/home/map7/.rvm/rubies/ruby-1.9.3-p194/bin...]
Tasks: TOP => features => cucumber => cucumber:ok
(See full trace by running task with --trace)
我将其追溯到rails.rb文件第17行，如错误中所述：
if !Rails.application.config.cache_classes
warn "WARNING: You have set Rails' config.cache_classes to false (most likely in config/environments/cucumber.rb). This setting is known to cause problems with database transactions. Set config.cache_classes to true if you want to use transactions. For more information see https://rspec.lighthouseapp.com/projects/16211/tickets/165."
end
因此看起来它在黄瓜中找不到Rails.application。
如果我进入控制台'rails c'并输入Rails.application.config，它会返回Configuration对象。
我尝试将我的cucumber-rails gem升级到1.3.0和黄瓜1.1.9。
答案 0 :(得分：6)
这可能是cucumber-rails gem的加载订单问题。如果您更新Gemfile而不立即加载它，则稍后将在此过程中要求：
gem "cucumber-rails", "1.3.0", :require => false