rails3 ActionController:RoutingError (uninitialized constant ApplicationControl

rails3 ActionController::RoutingError (uninitialized constant ApplicationControl
rails3 ActionController::RoutingError (uninitialized constant ApplicationController::LoginSystem)
碰到了这个问题，是因为rails3 不进行自动加载lib目录下的自定义module 了

需要在config/application.rb文件中
# Custom directories with classes and modules you want to be autoloadable.
# config.autoload_paths +=%W(#{config.root}/extras)

这两句就是进行让你启动时加载 classes 、modules的目录，你需要去设置才行，rails3 不给你自动加载。

改成如下格式就可以了：
# Custom directories with classes and modules you want to be autoloadable.
config.autoload_paths += %W(#{config.root}/lib)