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Rails：NameError：未初始化常量Rails :: Application :: YAML

ruby-on-railsrubyheroku
4
我试图将我的应用程序部署到Heroku，但出现了这个错误。我已经在谷歌上搜索过了，没有看到任何关于YAML问题的解决方案，所以想在网上寻求帮助。非常感谢您的帮助。
 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
@muistooshort，我不太确定我理解这个问题。我有一个database.yml和secrets.yml文件，以及en.yml文件。 - kkomaz
1
在你的Rails应用程序目录下运行grep -r YAML config命令，以查找config/文件夹中任何YAML实例。 - Prakash Murthy
4个回答
7

我不太确定发生了什么，但我做了一次

require 'yaml'

在我的production.rb文件中，它可以工作。我不知道为什么它能工作，但如果我找到原因，我会更新的。
1

一些版本的Rails存在一个bug（我知道的是4.2.1和4.2.2），在错误消息的第一行缺少require 'yaml'语句。在VPS上，您可以自己插入它，但我不确定如何在Heroku上操作。

当我在GitHub上提出这个问题时，有人建议我升级到下一个Rails版本...

0

我在development.rb、production.rb和test.rb中添加了require 'yaml'，只是为了保险起见。现在运行良好。Ruby 2.3.3和Rails 4.2.0。

0

我在使用 Docker 运行一个遗留的 Rails 2.3 应用程序时遇到了问题。

每当我使用命令 docker-compose up 启动应用程序时，都会遇到这个错误：

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)
以下是我如何解决的：

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

require 'yaml'

在 Rails 3.2 或 Rails 4.2 中，将以下内容添加到您的 config/application.rb 文件中：
require 'yaml'

就是这样了。

希望这能帮到你

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