Rails：NameError：未初始化的常量 Rails::Application::YAML

Question

我试图将我的应用程序部署到 heroku 并收到此错误。我一直在谷歌搜索，没有看到任何人有 YAML 问题，所以我想我在网上问。任何帮助将不胜感激

 remote: -----> Preparing app for Rails asset pipeline
 remote:        Running: rake assets:precompile
 remote:        rake aborted!
 remote:        NameError: uninitialized constant Rails::Application::YAML
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:377:in `secrets'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/config/environments/production.rb:2:in `block in <top (required)>'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/railtie.rb:210:in `instance_eval'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/railtie.rb:210:in `configure'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/config/environments/production.rb:1:in `<top (required)>'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:598:in `block (2 levels) in <class:Engine>'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:597:in `each'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:597:in `block in <class:Engine>'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in `each'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in `tsort_each_child'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/config/environment.rb:5:in `<top (required)>'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:328:in `require'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:328:in `require_environment!'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:443:in `block in run_tasks_blocks'
 remote:        /tmp/build_78ce680a858c094f796e2b21b5bb1826/vendor/bundle/ruby/2.0.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/task.rb:64:in `block (2 levels) in define'
 remote:        Tasks: TOP => environment
 remote:        (See full trace by running task with --trace)

查看我的 heroku 日志

 2015-06-07T00:58:16.085579+00:00 heroku[slug-compiler]: Slug compilation started
 2015-06-07T00:58:16.085600+00:00 heroku[slug-compiler]: Slug compilation failed: failed to compile Ruby app

Answer 1

我不太确定发生了什么，但我做了一个

require 'yaml'

在我的 production.rb 文件中，它起作用了。我不知道它为什么会起作用，但如果我发现会更新。

Answer 2

在某些版本的 rails 中存在错误（我知道的 4.2.1 和 4.2.2）错误消息第一行的文件中缺少 require 'yaml' 语句。在 VPS 上，您可以自己插入，但我不确定如何使用 Heroku 插入。 当我在 GitHub 上提出它时，我被建议升级到下一个 rails 版本......

Answer 3

为了安全起见，我在 development.rb、production.rb 和 test.rb 中添加了 require 'yaml'。现在工作正常。 Ruby 2.3.3 和 Rails 4.2.0

Answer 4

我在使用 Docker 处理旧版 Rails 2.3 应用程序时遇到了这个问题。

每当我使用命令docker-compose up 启动应用程序时都会遇到此错误：

web_1  | App 61 output: Error: The application encountered the following error: uninitialized constant YAML (NameError)
web_1  | App 61 output:     /workdir/config/environment.rb:13:in `block in <top (required)>'
web_1  | App 61 output:     /usr/local/bundle/bundler/gems/rails-3ce754b1f962/railties/lib/initializer.rb:113:in `run'
web_1  | App 61 output:     /workdir/config/environment.rb:3:in `<top (required)>'
web_1  | App 61 output:     config.ru:2:in `require'
web_1  | App 61 output:     config.ru:2:in `block in <main>'
web_1  | App 61 output:     /usr/local/bundle/gems/rack-1.4.7/lib/rack/builder.rb:51:in `instance_eval'
web_1  | App 61 output:     /usr/local/bundle/gems/rack-1.4.7/lib/rack/builder.rb:51:in `initialize'
web_1  | App 61 output:     config.ru:1:in `new'
web_1  | App 61 output:     config.ru:1:in `<main>'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:101:in `eval'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:101:in `preload_app'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:189:in `block in <module:App>'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:378:in `run_block_and_record_step_progress'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:188:in `<module:App>'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
web_1  | App 61 output:     /usr/local/bundle/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:29:in `<main>'
web_1  | [ E 2020-10-25 17:55:09.8091 27/Tc age/Cor/App/Implementation.cpp:221 ]: Could not spawn process for application /workdir: The application encountered the following error: uninitialized constant YAML (NameError)

这是我修复它的方法：

在 Rails 2.3 上，在您的 config/environment.rb 中添加以下内容：

require 'yaml'

在 Rails 3.2 或 Rails 4.2 上，在您的 config/application.rb 中添加以下内容：

require 'yaml'

就是这样。

我希望这会有所帮助