关于自定义错误处理

在项目中很多情况希望能自定义处理某些异常情况，通常采用重写rescue_action方法。一般网上能看到的代码都是以下的形式：

[code]

def rescue_action(exception)

rescue_action_in_public(exception)

end

def rescue_action_in_public(exception)

logger.error("rescue_action_in_public executed")

case exception

when ActiveRecord::RecordNotFound, ActionController::RoutingError,

ActionController::UnknownAction,ActionController::UnknownAction

logger.error("404 displayed")

render(:file => "#{RAILS_ROOT}/public/404.rhtml",:layout=>'error',

:status => "404 Not Found")

else

logger.error("500 displayed")

render(:file => "#{RAILS_ROOT}/public/500.rhtml",:layout=>'error',

:status => "500 Error")

end

end

[/code]

这样经常会报：

uninitialized constant ActionWebService::Dispatcher::ActionController::RoutingError错误，解决的办法是在ActionController前加::， 正确的格式应该如下：

[code]

case exception

when ActiveRecord::RecordNotFound, ::ActionController::RoutingError,

::ActionController::UnknownAction,::ActionController::UnknownAction

logger.error("404 displayed")

render(:file => "#{RAILS_ROOT}/public/404.rhtml",:layout=>'error',

:status => "404 Not Found")

else

logger.error("500 displayed")

render(:file => "#{RAILS_ROOT}/public/500.rhtml",:layout=>'error',

:status => "500 Error")

end

[/code]