如何查看已删除的RDS实例上的事件？(How to see events on RDS instance which is deleted?)

 一般来说，如果你想修补一些内置的方法，你应该首先为原始方法制作一个别名。 大多数情况下，你会用最重要的方法在某处调用旧的。 否则，您将失去原始方法的功能，并且可能会破坏应用程序逻辑。 
 
 
 
 使用ri require或阅读文档以找出require方法的定义位置。 你会发现它在Kernel模块中。 此外，您将找到其方法签名，以便您知道参数列表的外观。 
 
 
 Monkey补丁模块Kernel 。 除非你知道你在做什么，否则不要中断功能。 
 
 
module Kernel
  # make an alias of the original require
  alias_method :original_require, :require

  # rewrite require
  def require name
    puts name
    original_require name
  end
end

# test the new require
require 'date'

Generally, if you want to patch some built-in method, you should first make an alias for the original method. Most of the time you'll call the old one somewhere in your overriding method. Otherwise you'll lost the functionality of the original method and it's likely to break the application logic.
 
 
 
Use ri require or read the documentation to find out where the require method is defined. You'll find it's in Kernel module. Besides, you'll find its method signature so you know what the parameter list looks like.
 
 
Monkey patch module Kernel. DON'T break the functionality unless you know what you are doing.
 
 
module Kernel
  # make an alias of the original require
  alias_method :original_require, :require

  # rewrite require
  def require name
    puts name
    original_require name
  end
end

# test the new require
require 'date'