Rails 4.0.0 开发环境一切正常，到生成环境发现 无法找到 css 和 js

# Production  冰山一角的悲剧啊

Started GET "/discount_service/assets/admin.js?body=1" for 127.0.0.1 at 2014-05-23 14:50:24 +0800

ActionController::RoutingError (No route matches [GET] "/discount_service/assets/admin.js"):
  actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
  actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.0.0) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.0.0) lib/rails/rack/logger.rb:21:in `block in call'
  activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `block in tagged'
  activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in `tagged'
  activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `tagged'
  railties (4.0.0) lib/rails/rack/logger.rb:21:in `call'
  actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in `call'
  railties (4.0.0) lib/rails/engine.rb:511:in `call'
  railties (4.0.0) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  puma (2.6.0) lib/puma/server.rb:486:in `handle_request'
  puma (2.6.0) lib/puma/server.rb:357:in `process_client'
  puma (2.6.0) lib/puma/server.rb:250:in `block in run'
  puma (2.6.0) lib/puma/thread_pool.rb:92:in `call'
  puma (2.6.0) lib/puma/thread_pool.rb:92:in `block in spawn_thread'

1.gemFile

在rails 4 之后没有grop 了 要记得哦

# group :assets do
gem 'sass-rails', '~> 4.0.0'
gem 'coffee-rails', '~> 4.0.0'    
gem 'uglifier', '>= 1.3.0'
# end
# 页面渲染
gem 'jquery-rails'  #这个
gem 'execjs'      # 记得这个
gem 'turbolinks'

2.在 config/application.rb 记得 application 文件 不要对了哦

config.assets.precompile << Proc.new do |path|
      if path =~ /.(css|js|scss|png|jpg|gif|json)z/
        full_path = Rails.application.assets.resolve(path).to_path
        app_assets_path1 = Rails.root.join('app', 'assets').to_path
        app_assets_path2 = Rails.root.join('public', 'assets').to_path
        app_assets_path3 = Rails.root.join('vendor', 'assets').to_path


        if full_path.starts_with? app_assets_path1
          true
        else
          if full_path.starts_with? app_assets_path2
            true
          else
            if full_path.starts_with? app_assets_path3
              true
            else
              false
            end
          end
        end
      end
    end

3.秘诀 config/environment/production.rb

   config.action_controller.relative_url_root = '/discount_service'  #是用来 实用啊
   config.serve_static_assets = true
   # Compress JavaScripts and CSS.
  config.assets.compress = true
   config.assets.js_compressor = :uglifier
   config.assets.css_compressor = :sass

4.最后要记得这个 啊 

RAILS_ENV=production rake assets:precompile