有耙子的问题
我正在运行Rails 3.1.1并在运行此命令时出现此错误。 显然是Rails的新手，任何帮助表示赞赏：
耙子流产了！ nil的未定义方法“先决条件”：NilClass
/Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rspec-rails-2.6.0/lib/rspec/rails/tasks/rspec.rake:3:in `' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rspec-rails-2.6.0/lib/rspec-rails.rb:10:in `load' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rspec-rails-2.6.0/lib/rspec-rails.rb:10:in `block in ' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/railtie.rb:183:in `call' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/railtie.rb:183:in `block in load_tasks' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/railtie.rb:183:in `each' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/railtie.rb:183:in `load_tasks' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/engine.rb:396:in `block in load_tasks' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/application/railties.rb:8:in `each' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/application/railties.rb:8:in `all' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/engine.rb:396:in `load_tasks' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/application.rb:103:in `load_tasks' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `method_missing' /Users/220040168/rails_projects/sample_app/Rakefile:7:in `' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/bin/rake:33:in `' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin/rake:19:in `load' /Users/220040168/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin/rake:19:in `' 这不是我第一次运行此命令，但第一次出现此错误。
的Gemfile
source 'http://rubygems.org' gem 'rails', '3.1.1' # Bundle edge Rails instead: # gem 'rails', :git => 'git://github.com/rails/rails.git' gem 'sqlite3' group :development do gem 'rspec-rails', '2.6.0' end group :test do gem 'rspec', '2.6.0' gem 'webrat', '0.7.1' gem 'autotest', '4.3.2' gem 'autotest-rails-pure', '4.1.0' gem 'autotest-fsevent', '0.2.2' gem 'autotest-growl', '0.2.4' end # Gems used only for assets and not required # in production environments by default. group :assets do gem 'sass-rails', '~> 3.1.4' gem 'coffee-rails', '~> 3.1.1' gem 'uglifier', '>= 1.0.3' end gem 'jquery-rails' # To use ActiveModel has_secure_password # gem 'bcrypt-ruby', '~> 3.0.0' # Use unicorn as the web server # gem 'unicorn' # Deploy with Capistrano # gem 'capistrano' # To use debugger # gem 'ruby-debug19', :require => 'ruby-debug'
看起来与此问题相关https://github.com/rails/rails/issues/1197尝试升级到比2.6.0更新的rspec-rails版本