關于自定義錯誤處理

在項目中很多情況希望能自定義處理某些異常情況，通常采用重寫rescue_action方法。一般網上能看到的代碼都是以下的形式：

[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]

這樣經常會報：

uninitialized constant ActionWebService::Dispatcher::ActionController::RoutingError錯誤，解決的辦法是在ActionController前加::， 正确的格式應該如下：

[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]