和我当时一样。不知道你看过这个没有，没看过的话现在可以看看。我认为是没有执行

bundle exec rake assets:precompile

或者关闭

http://guides.ruby-china.org/asset_pipeline.html#1

不确定是否跟 production.rb 有关不，这里也贴一下

cat config/environments/production.rb

RailsApp::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # Code is not reloaded between requests
  config.cache_classes = true

  # Full error reports are disabled and caching is turned on
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_assets = true

  # Compress JavaScripts and CSS
  config.assets.compress = true

  # Don't fallback to assets pipeline if a precompiled asset is missed
  # config.assets.compile = true
  config.assets.compile = true

  # Generate digests for assets URLs
  config.assets.digest = false

  # Defaults to nil and saved in location specified by config.assets.prefix
  # config.assets.manifest = YOUR_PATH

  # Specifies the header that your server uses for sending files
  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  # config.force_ssl = true

  # See everything in the log (default is :info)
  # config.log_level = :debug

  # Prepend all log lines with the following tags
  # config.log_tags = [ :subdomain, :uuid ]

  # Use a different logger for distributed setups
  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)

  # Use a different cache store in production
  # config.cache_store = :mem_cache_store

  # Enable serving of images, stylesheets, and JavaScripts from an asset server
  # config.action_controller.asset_host = "http://assets.example.com"

  # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
  # config.assets.precompile += %w( search.js )
  # config.assets.precompile += ["*.js", "*.css"]

  # Disable delivery errors, bad email addresses will be ignored
  # config.action_mailer.raise_delivery_errors = false

  # Enable threaded mode
  # config.threadsafe!

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation can not be found)
  config.i18n.fallbacks = true

  # Send deprecation notices to registered listeners
  config.active_support.deprecation = :notify

  # Log the query plan for queries taking more than this (works
  # with SQLite, MySQL, and PostgreSQL)
  # config.active_record.auto_explain_threshold_in_seconds = 0.5
end

#1 楼 @metal 上传到 openshift 的时候，显示已经执行

remote: Precompiling with 'bundle exec rake assets:precompile'

而且同目录下的 home.scss 已经正确生成 home.css

#3 楼 @rubybird 你有没有试过吧 application.css 改成 application.css.scss

不知道 rails 会不会去识别 css 里这样的东西。

*= require_self
*= require_tree .

看了一下原来 application.css 就是默认。真是搞不懂。我上次也有这样的问题。后来发现没有

bundle exec rake assets:precompile RAILS_ENV= production

#4 楼 @metal

还没有试，刚好有这个想法。

在本地执行 rake assets:precompile 又可以正确生成哦，只是上传到 openshift 的时候没有生成，这是让人困惑的地方。

#6 楼 @rubybird 我看了一下 rails 默认 application.css 就是 css。。。应该没关系。

#5 楼 @metal 确实是没有

bundle exec rake assets:precompile RAILS_ENV= production

的问题

虽然 openshift 的提示了

remote: Precompiling with 'bundle exec rake assets:precompile'

但是似乎它没有正确工作，当我在.openshift/action_hooks/deploy 的文件中增加

bundle exec rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets

重新上传，application.css 工作正常。

还是有人用 openshift 的啊

config/application.rb config.assets.enabled = true ?