如何在 Ruby 中覆盖 require? [英] How to override require in Ruby?

问题描述

我需要从一个 Ruby 文件中覆盖 require，这是我的 start.rb 所必需的，它是应用程序入口点.rubygems 在此之前加载，在 start.rb 中.

I need to override require from within a Ruby file, which is required from my start.rb, which is the application entry point. rubygems is loaded before this, in start.rb.

我尝试的所有方法都给我一个堆栈溢出错误.

Everything I tried gave me a stack overflow error.

正确的做法是什么?

推荐答案

一般来说，如果你想修补一些内置方法，你应该先为原始方法制作一个别名.大多数情况下，您会在覆盖方法的某处调用旧的.否则，您将失去原始方法的功能，并且很可能会破坏应用程序逻辑.

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.

1. 使用ri require 或阅读文档以找出require 方法的定义位置.您会在 Kernel 模块中找到它.此外，您会找到它的方法签名，以便您了解参数列表的样子.
2. Monkey 补丁模块 Kernel.不要破坏功能，除非您知道自己在做什么.

1. 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.
2. 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'

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