升级到 rails 4.0.0.rc2 后，Rspec for helper 失败答案

【问题标题】：Rspec for helper fails after upgrade to rails 4.0.0.rc2升级到 rails 4.0.0.rc2 后，Rspec for helper 失败
【发布时间】：2013-06-09 07:49:57
【问题描述】：

我正在关注rails tutorial，已完成第 5 章，并决定从 Rails 4 beta1 升级到新发布的 rc2。 现在规范失败了。

... application_helper_spec.rb:3:in `<top (required)>':
      uninitialized constant ApplicationHelper (NameError)

我已经用rm 和bundle exec rspec --init 擦除并重新创建了spec_helper.rb 文件，这解决了我的第一个问题。我对第二个问题感到困惑，即规范没有找到我定义的应用程序助手。

完整的错误输出：

tim@atom:~/repo/rails_tutorial_sample_app$ bundle exec rspec
No DRb server is running. Running in local process instead ...
/home/tim/repo/rails_tutorial_sample_app/spec/helpers/application_helper_spec.rb:3:in `<top (required)>': uninitialized constant ApplicationHelper (NameError)
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `block in load_spec_files'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `each'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load_spec_files'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/command_line.rb:22:in `run'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:77:in `rescue in run'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:73:in `run'
    from /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:17:in `block in autorun'

我不明白它是如何很好地加载内容以进行故障排除的。我通读了Rails/RSpec - writing tests for original helper methods，这里提到的一切似乎都井井有条。

这是两个明显相关的文件：

spec/helpers/application_helper_spec.rb

require 'spec_helper'

describe ApplicationHelper do
  describe "full_title" do
    it "should include the page title" do
      expect(full_title("foo")).to match(/foo/)
    end

    it "should include the base title" do
      expect(full_title("foo")).to match(/^Ruby on Rails Tutorial Sample App/)
    end

    it "should not include a bar for the home page" do
      expect(full_title("")).not_to match(/\|/)
    end
  end
end

app/helpers/application_helper.rb

module ApplicationHelper

  # full title on per page basis
  def full_title(page_title)
    base_title = "Ruby on Rails Tutorial Sample App"
    if page_title.empty?
      base_title
    else
      "#{base_title} | #{page_title}"
    end
  end
end

我的完整来源在https://github.com/timabell/rails_tutorial_sample_app/tree/4b3d93bbfdb0adb36b87b760c90c3bdda87def16

停下！我喜欢在最深处，但我想我只是淹死了......

【问题讨论】：

试试 rails g rspec:install - 你当前的 spec_helper 看起来不对。
hrmm，该命令抛出了我之前遇到的错误。 bundle exec rails g rspec:install /home/tim/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/configuration.rb:144:in `const_get': uninitialized constant ActionDispatch::Session::EncryptedCookieStore (NameError) ...
我看看stackoverflow.com/a/15849479/10245然后回来，看起来和我一样。

标签： ruby-on-rails rspec railstutorial.org ruby-on-rails-4

【解决方案1】：

Rails Core 团队对破坏 beta1 测试的 RC 进行了一些更改，因此您必须对其进行更改。本教程已更新，但如果您遵循旧版本，则当前代码库中的一些过时测试应删除。除了在书中稍微回溯一下，我建议看一下latest version of the sample app code（我刚刚更新为使用Rails 4.0 RC2）。这应该可以帮助您找到正确替换损坏的测试。

【讨论】：