将我的应用程序升级到 rails 3.1.1 时出现 NameError答案

【问题标题】：Getting a NameError when upgrading my app to rails 3.1.1将我的应用程序升级到 rails 3.1.1 时出现 NameError
【发布时间】：2011-10-19 02:03:35
【问题描述】：

我的应用程序的名称是 newsample_app 。我正在关注 railstutorial 截屏视频以升级到 rails 3.1。这是我在将文件从旧的“sample_app”复制到“newsample_app”并尝试运行 rspec 时收到的错误消息：

rspec 规范/控制器/pages_controller_spec.rb /Users/topica/rails_projects/newsample_app/config/routes.rb:1:in `': 未初始化的常量 NewSampleApp (NameError)

看到这个后，我将我的 routes.rb 文件从原来的 sample_app 从“SampleApp::Application.routes.draw do”更改为：“NewSampleApp::Application.routes.draw do”，但仍然出现错误.有什么想法吗？

仅供参考完整错误：

Topicas-MacBook-Pro:newsample_app topica$ rspec spec/controllers/pages_controller_spec.rb
/Users/topica/rails_projects/newsample_app/config/routes.rb:1:in `<top (required)>': uninitialized constant NewSampleApp (NameError)
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `block in load_paths'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `each'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `load_paths'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:13:in `reload!'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:7:in `block in initialize'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `call'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `execute_if_updated'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/finisher.rb:63:in `block (2 levels) in <module:Finisher>'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/finisher.rb:64:in `call'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application/finisher.rb:64:in `block in <module:Finisher>'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `instance_exec'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `run'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `each'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `run_initializers'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/application.rb:96:in `initialize!'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /Users/topica/rails_projects/newsample_app/config/environment.rb:5:in `<top (required)>'
    from /Users/topica/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /Users/topica/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /Users/topica/rails_projects/newsample_app/spec/spec_helper.rb:3:in `<top (required)>'
    from /Users/topica/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /Users/topica/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /Users/topica/rails_projects/newsample_app/spec/controllers/pages_controller_spec.rb:1:in `<top (required)>'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `load'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `block in load_spec_files'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `map'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `load_spec_files'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:18:in `run'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:80:in `run_in_process'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:69:in `run'
    from /Users/topica/.rvm/gems/ruby-1.9.2-p290@rails3_1tutorial/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:11:in `block in autorun'

【问题讨论】：

标签： ruby-on-rails nameerror

【解决方案1】：

您可能希望它与 config/application.rb 中的相同如果它真的是 newsample_app，那么它可能是 NewsampleApp 而不是 NewSampleApp

【讨论】：

天哪。两者都正确。下次我会直接去 irb 获取 .camelize 。谢谢你的帮助，不会再犯这个错误了:)
@house9 我觉得很接近。我给你一个 +1 的努力。

【解决方案2】：

看起来像一个案例问题。

> "newsample_app".camelize
 => "NewsampleApp"

注意小写的“s”。

【讨论】：