ruby-on-rails-3 – uglifier在rails中不起作用

config/application.rb
...
# Enable the asset pipeline
config.assets.enabled = true
# Version of your assets,change this if you want to expire all your assets
config.assets.version = '1.0'
config.assets.digest = true
config.assets.paths << "#{Rails.root}/vendor/assets/images" 
...


config/environment.rb
...
ENV['RAILS_ENV'] ||= 'production'
...

My gemfile
...
gem 'uglifier'
# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',"  ~> 3.1.0"
  gem 'coffee-rails',"~> 3.1.0"
  #gem 'uglifier'
end
...

environment/production.rb
....
    config.active_support.deprecation = :notify
    config.assets.enabled = true
    config.assets.js_compressor  = :uglifier
    config.assets.css_compressor = :scss
    config.assets.compress = false
...

我在app / assets / javascripts中有我的javascript文件.我的javascript文件没有被压缩.按照这个url http://dev.mensfeld.pl/category/rails3/进行锻炼压缩.

谢谢你的任何指示.