ruby-on-rails – 修改Rails 3中默认ActionController LogSubscr

我对它的各个方面并不特别满意(例如,必须取消订阅所有对’process_action.action_controller’的兴趣),我当然会接受更好的答案.

我们将以下内容添加为config / initializers / custom_ac_log_subscriber.rb

module MyApp
  class CustomAcLogSubscriber < ActiveSupport::LogSubscriber
    INTERNAL_PARAMS = ActionController::LogSubscriber::INTERNAL_PARAMS

    #Do your custom stuff here. (The following is much simplified).
    def start_processing(event)
      payload = event.payload
      params  = payload[:params].except(*INTERNAL_PARAMS)
      info "Processing #{payload[:controller]}##{payload[:action]} (...)"
      info "  Parameters: #{params.inspect}" unless params.empty?
    end

    def process_action(event)
      payload   = event.payload
      message = "Completed in %.0fms [#{payload[:path]}]" % event.duration
      info(message)
    end

    def logger
      ActionController::Base.logger
    end
  end
end

#Prevent ActionController::LogSubscriber from also acting on these notifications
#Note that the following undesireably unregisters *everyone's*
#interest in these.  We can't target one LogSubscriber,it seems(?)
%w(process_action start_processing).each do |evt|
  ActiveSupport::Notifications.unsubscribe "#{evt}.action_controller"
end

#Register our own interest
MyApp::CustomAcLogSubscriber.attach_to :action_controller

关于中止初始方法的说明：

我最初尝试了取消注册默认LogSubscriber的方法,意图是我们的自定义将继承并完成所有工作(无需重新注册).

但是,存在许多问题.

1)删除LogSubscriber是不够的,如下所示：

ActiveSupport::LogSubscriber.log_subscribers.delete_if{ |ls| 
  ls.instance_of? ActionController::LogSubscriber }

由于通知请求仍在注册.

2)此外,当您继承LogSubscriber并注册它时,似乎不会使用继承的实现调用任何未重写的方法.