Ruby on Rails 测试和控制台都以 cache_control 错误退出答案

【问题标题】：Ruby on Rails test and console both exit with cache_control errorRuby on Rails 测试和控制台都以 cache_control 错误退出
【发布时间】：2019-05-08 16:07:50
【问题描述】：

我被难住了。 rails test 和 rails console 突然停止为我的项目工作，我找不到我最近为导致问题所做的任何更改。运行任何一个都会引发此错误：

/var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_dispatch/http/response.rb:89:in `<class:Response>': undefined method `cache_control' for class `ActionDispatch::Response' (NameError)
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_dispatch/http/response.rb:35:in `<module:ActionDispatch>'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_dispatch/http/response.rb:6:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller/metal/live.rb:1:in `require'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller/metal/live.rb:1:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller.rb:4:in `require'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller.rb:4:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller/railtie.rb:2:in `require'
    from /var/lib/gems/2.3.0/gems/actionpack-5.1.7/lib/action_controller/railtie.rb:2:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/activerecord-5.1.7/lib/active_record/railtie.rb:9:in `require'
    from /var/lib/gems/2.3.0/gems/activerecord-5.1.7/lib/active_record/railtie.rb:9:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/railties-5.1.7/lib/rails/all.rb:14:in `require'
    from /var/lib/gems/2.3.0/gems/railties-5.1.7/lib/rails/all.rb:14:in `block in <top (required)>'
    from /var/lib/gems/2.3.0/gems/railties-5.1.7/lib/rails/all.rb:12:in `each'
    from /var/lib/gems/2.3.0/gems/railties-5.1.7/lib/rails/all.rb:12:in `<top (required)>'
    from /home/jeff/src/rails/sfpix/config/application.rb:3:in `require'
    from /home/jeff/src/rails/sfpix/config/application.rb:3:in `<top (required)>'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `require'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `preload'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:153:in `serve'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
    from /var/lib/gems/2.3.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
    from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

谷歌搜索没有提供任何有用的建议。我尝试检查早期的工作提交并运行 bundle install 以使用 Gemfile.lock 文件降级 gem，但我仍然收到相同的错误消息。

如果我 chdir 进入其他 Rails 项目，rails test 和 rails console 工作正常。

有人知道从哪里开始寻找吗？

非常感谢，
杰夫

【问题讨论】：

哎呀。我现在看到我也不能使用rails generate。我死在水里了。有人可以帮忙吗？

标签： ruby-on-rails

【解决方案1】：

Github 上有人建议我至少升级到 Rack 2.0。这立即解决了我的问题。 ?

【讨论】：