Ruby on rails Rails:NameError:未初始化的常量Rails:：Application:：YAML

我试图将我的应用程序部署到heroku，但出现了此错误。我一直在谷歌上搜索，没有看到任何人有YAML问题，所以我想我在网上问一下。任何帮助都将不胜感激

 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)

---

我不太清楚发生了什么事，但我做了一个调查

require 'yaml'

---

在我的production.rb文件中，它成功了。我不知道为什么它是工作，但会更新，如果我发现

rails的某些版本（据我所知，4.2.1和4.2.2）中有一个bug，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，但我不知道如何使用Heroku。

---

当我在GitHub上提出它时，有人建议我升级到下一个rails版本

为了安全起见，我在development.rb、production.rb和test.rb中添加了

要求“yaml”

。现在一切正常。Ruby 2.3.3和Rails 4.2.0

我在使用Docker处理传统的Rails 2.3应用程序时遇到了这个问题

每当使用命令

docker compose up

启动应用程序时，我都会遇到此错误：

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)

在Rails 3.2或Rails 4.2上，在

config/application.rb

中添加以下内容：

require 'yaml'

require 'yaml'

就这些

---

我希望这有帮助

@muistoshort不确定我是否理解这个问题。我有一个database.yml和secrets.yml文件以及en.yml文件运行rails应用程序目录中的

grep-r YAML config

，在

config/

文件夹中查找

YAML

的任何实例。

require 'yaml'