rake assets：尝试连接数据库的预编译

时间：2012-01-25 02:38:54

标签： ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-3.2

我正在尝试调试运行rake assets:precompile --trace时我的应用程序尝试连接到我的数据库的原因。

我可能在堆栈跟踪中遗漏了一些东西......有人看到了相关的行吗？

DEPRECATION WARNING: The InstanceMethods module inside ActiveSupport::Concern will be no longer included automatically. Please define instance methods directly in ActionController::Base instead. (called from <top (required)> at /Users/Kyle/Desktop/skateparks-web/config/application.rb:4)
** Invoke assets:precompile (first_time)
** Execute assets:precompile
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/bin/ruby /Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets --trace
DEPRECATION WARNING: The InstanceMethods module inside ActiveSupport::Concern will be no longer included automatically. Please define instance methods directly in ActionController::Base instead. (called from <top (required)> at /Users/Kyle/Desktop/skateparks-web/config/application.rb:4)
** Invoke assets:precompile:all (first_time)
** Execute assets:precompile:all
** Invoke assets:precompile:primary (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
rake aborted!
FATAL:  database "skateparks_production" does not exist
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:1161:in `initialize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:1161:in `new'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:1161:in `connect'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:316:in `initialize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:27:in `new'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:27:in `postgresql_connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:277:in `new_connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:287:in `checkout_new_connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:235:in `block (2 levels) in checkout'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `loop'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `block in checkout'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `checkout'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in `connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:374:in `retrieve_connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/model_schema.rb:308:in `clear_cache!'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activerecord-3.2.0/lib/active_record/railtie.rb:91:in `block (2 levels) in <class:Railtie>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:418:in `_run__2041913228368879189__prepare__1991931652306887621__callbacks'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:405:in `__run_callback'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:385:in `_run_prepare_callbacks'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:81:in `run_callbacks'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/action_dispatch/middleware/reloader.rb:74:in `prepare!'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/action_dispatch/middleware/reloader.rb:48:in `prepare!'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/application/finisher.rb:48:in `block in <module:Finisher>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/initializable.rb:30:in `instance_exec'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/initializable.rb:30:in `run'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/initializable.rb:54:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/initializable.rb:54:in `run_initializers'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/application.rb:136:in `initialize!'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/railtie/configurable.rb:30:in `method_missing'
/Users/Kyle/Desktop/skateparks-web/config/environment.rb:5:in `<top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/dependencies.rb:251:in `require'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/dependencies.rb:251:in `block in require'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/activesupport-3.2.0/lib/active_support/dependencies.rb:251:in `require'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/application.rb:103:in `require_environment!'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/railties-3.2.0/lib/rails/application.rb:292:in `block (2 levels) in initialize_tasks'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/sprockets/assets.rake:89:in `block (2 levels) in <top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:174:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/sprockets/assets.rake:56:in `block (3 levels) in <top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/bin/rake:19:in `load'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/bin/rake:19:in `<main>'
Tasks: TOP => environment
rake aborted!
Command failed with status (1): [/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/bi...]
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils.rb:53:in `block in create_shell_runner'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils.rb:45:in `call'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils.rb:45:in `sh'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils_ext.rb:36:in `sh'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils.rb:78:in `ruby'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/file_utils_ext.rb:36:in `ruby'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/sprockets/assets.rake:9:in `ruby_rake_task'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/sprockets/assets.rake:17:in `invoke_or_reboot_rake_task'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/actionpack-3.2.0/lib/sprockets/assets.rake:25:in `block (2 levels) in <top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/Kyle/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/bin/rake:19:in `load'
/Users/Kyle/.rvm/gems/ruby-1.9.2-p290@skateparks/bin/rake:19:in `<main>'
Tasks: TOP => assets:precompile

6 个答案:

答案 0 :(得分：40)

rake assets:precompile默认初始化您的应用，其中包括与数据库的连接。

在config/application.rb内，您可以添加此内容，但请参阅以下链接以获取有关该警告的信息：

config.assets.initialize_on_precompile = false

Rails Guide on Precompiling Assets

答案 1 :(得分：5)

如果在您的情况下有意义，您可以使用以下命令选择应该使用哪个环境assets:precompile：

rake assets:precompile:all RAILS_ENV=development RAILS_GROUPS=assets

这对我的部署有意义，因为通常：

  1. 我使用rake在我的开发机器上生成资源（因为我的vps的内存有些限制）
  2. 我使用在public / assets
    3. 中生成的资产压缩所有应用程序
  3. 我将zip转移到vps并解压缩包

    4. 希望它有所帮助。

答案 2 :(得分：3)

我遇到了同样的问题。将Sprockets更新到版本3后，每当我尝试在本地预编译资产（开发）时，无论使用生产环境的设置，我都会遇到此错误：

rake aborted! Gem::LoadError: Specified 'postgresql' for database adapter, but the gem is not loaded. Add gem'pg'to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).

因为在我的本地（开发）我使用MySQL和服务器（生产），我使用Postgres。

标记为已解决的答案对我不起作用，因为config.assets.initialize_on_precompile中没有Rails 4.2.1。

要解决这个问题，我遵循了3个简单的步骤：

  1. 在您的Gemfile中，添加：gem "activerecord-nulldb-adapter"

  2. 在database.yml中，按以下方式更改适配器：

    production: 

    adapter: <%= ENV['DB_ADAPTER'] ||= 'postgresql' %>

  3. 在本地编译您的生产资产。在您的终端中运行：DB_ADAPTER=nulldb RAILS_ENV=production rake assets:precompile

    4. 这个解决方案解决了我，我看到了here。

答案 3 :(得分：1)

较新版本的Rails不会在资产预编译期间加载数据库。但是，初始化程序通常会导致其加载。调试可能会令人沮丧，因为该错误会忽略堆栈跟踪。

./bin/rails assets:precompile
(in ~/src/nautilus)
rake aborted!
ActiveRecord::NoDatabaseError: FATAL:  database "your_app_development" does not exist
bundler: failed to load command: rake (~/src/your_app/vendor/bundle/ruby/2.6.0/bin/rake)
NoMethodError: undefined method `reject' for nil:NilClass

小于有用的错误。

那么，我们如何找出问题出在哪里？

将所有初始化器移出config/initializers，然后运行./bin/rails assets:precompile。

如果有效，那很好，您知道问题出在那些文件之一。

将它们一一移回，直到找到有问题的文件。

现在发现了问题，我们该如何解决？

然后，当我发现有问题的Initialilzer时，请使用以下检查方法对其进行包装：

unless ARGV.include? "assets:precompile"
  # ...
end

与nulldb相比，我更喜欢这样做，因为它减少了我必须在应用程序中维护的依赖项数量。

答案 4 :(得分：1)

也许这不适用于所有情况，但是我可以通过在某些地方用{{1}下方的代码段包围代码来避免Rails尝试在rake assets:*任务上连接数据库。 }：

/config/routes.rb

有时会加载依赖于外部服务或环境变量的代码，因为初始化文件上的代码对于资产进行预编译不是必需的。

我最近遇到了类似的问题，上面的回答对我不起作用。我在unless defined?(::Rake::SprocketsTask) devise_for ... #... end devise_scope ... #... end end 上找到了引起该问题的文件，并用以下代码包装了该文件：

config/initializers/

当运行unless defined?(::Rake::SprocketsTask) #... end 或其他类似rake assets:precompile的代码时，上面的代码段也会跳过其中的代码。

希望这会在将来对其他人有所帮助！

答案 5 :(得分：-1)

（在所有环境中）检查您的配置文件。例如

rake assets:precompile

正在开发中，但是您在生产中遇到了问题

RAILS_ENV=production bundle exec rake assets:precompile

那么您很可能在 /config/environments/production.rb

中引用了活动记录

config.active_record.dump_schema_after_migration = false

如果您打算不利用活动记录或采用NoSQL（例如mongo），则完全避免这种情况，您可能希望按以下方式初始化新应用：

rails new myApp --skip-active-record

就我而言，它等效于-O（大写O）。

相关问题
最新问题