rake中止！未定义的方法'先决条件的零：NilClass

剧透：这是rspec-rails宝石过时的版本！ “：迁移耙分贝”，以确保一切仍然工作rake中止！未定义的方法'先决条件的零：NilClass

我感动我的sqlite3的宝石成开发区块，然后运行后，遇到这个错误与我的Rails项目目录发出任何rake命令。 Rake在我系统的其他地方工作正常。但是，任何耙的任务，我在该目录中运行给我下面的输出与跟踪：

/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.0.beta.18/lib/rspec/rails/tasks/rspec.rake:3:in `<top (required)>' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:8:in `load' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:8:in `block in <class:Railtie>' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/railtie.rb:183:in `call' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/railtie.rb:183:in `block in load_tasks' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/railtie.rb:183:in `each' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/railtie.rb:183:in `load_tasks' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/engine.rb:396:in `block in load_tasks' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/application/railties.rb:8:in `each' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/application/railties.rb:8:in `all' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/engine.rb:396:in `load_tasks' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/application.rb:103:in `load_tasks' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/railtie/configurable.rb:30:in `method_missing' 
/Users/ianyoung/rails/third_app/Rakefile:7:in `<top (required)>' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `load' 
/Users/ianyoung/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `<main>'

我得到的第一个错误是问题的标题：耙中止！未定义的方法'先决条件的零：NilClass

我也一直得到这个，但它尚未引起我的问题。也许它是相关的吗？：

退化警告：在Rails :: Railtie中的config.generators已被弃用。请改用config.app_generators。（从/Users/ianyoung/rails/third_app/config/application.rb:13调用）弃用警告：在Rails的config.generators :: Railtie已被弃用。请改用config.app_generators。（从/Users/ianyoung/rails/third_app/config/application.rb:13调用）

来源

2012-01-13 eeeeeean

为什么你使用rspec-rails的旧版本？ – 2012-01-13 23:05:48

这是rspec-rails的一个非常旧的版本，很可能会被更新版本的rake破坏。我会尝试首先更新rspec-rails – 2012-01-13 23:07:06

你更新了Rubygems吗？ – eveevans 2012-01-13 23:08:26

更新到最新的RSpec的护栏宝石消除了我这个问题，并弃用警告。

安装最新webrat宝石解决失踪has_selector？方法问题，因为某种原因，我认为这是比我过时的rspec-rails gem更大的罪恶。一切都很好。

谢谢你的有用的意见。

来源

2012-01-16 04:50:25 eeeeeean

rake中止！未定义的方法'先决条件的零：NilClass

回答

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