【发布时间】：2013-12-05 05:49:30
【问题描述】：
我刚刚安装了carrierwave，并将我的rails 4 应用程序设置为通过雾存储在Amazon s3 上的图像。该应用程序正在使用 Carrierwave 工作并部署到 Heroku（但图像正在被 dyno 清除）。在一些最初的问题之后，我让它在我的本地主机上工作（据我所知）。
现在我无法将新版本推送到 Heroku。我已经重置了数据库。预编译资产，现在尝试迁移数据库。以下是我遇到的错误。
Running `rake db:migrate` attached to terminal... up, run.6517
rake aborted!
uninitialized constant Sprockets::Helpers
/app/app/uploaders/image_uploader.rb:12:in `<class:ImageUploader>'
/app/app/uploaders/image_uploader.rb:4:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:465:in `block (2 levels) in eager_load!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:464:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:464:in `block in eager_load!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:462:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:462:in `eager_load!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:347:in `eager_load!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application/finisher.rb:56:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application/finisher.rb:56:in `block in <module:Finisher>'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `instance_exec'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `run'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/initializable.rb:55:in `block in run_initializers'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/initializable.rb:54:in `run_initializers'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application.rb:215:in `initialize!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:30:in `method_missing'
/app/config/environment.rb:5:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application.rb:189:in `require_environment!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application.rb:249:in `block in run_tasks_blocks'
Tasks: TOP => db:migrate => environment
我尝试在 Uploader 文件中包含和不包含 Sprocket，但无论哪种方式都出现相同的错误。我知道 Sprockets 不再包含在 Rails 4 的 master 中。我现在已经安装了 sprockets-rails 和 sprockets-helper gems。我还尝试在文件顶部要求它们（我不完全理解这一点，但遵循这个建议https://github.com/petebrowne/sprockets-helpers）。没有任何效果。关于如何解决这个问题的任何建议。如何初始化 Sprockets::Helpers。谢谢。
【问题讨论】：
标签： ruby-on-rails heroku amazon-web-services carrierwave sprockets