如何为 Ruby 编写猴子补丁？

发布于 2024-10-02 16:51:00 字数 177 浏览 5 评论 0原文

我正在使用 Rails 3 并收到如下所示的错误：

undefined method `persisted?' for []:Array

我想使用 Monkeypatch 来修复此问题。首先：它应该是什么样子？我对Ruby源代码中Array类的嵌套知之甚少。我很感激指导。

原文

I am using Rails 3 and getting an error that looks like this:

undefined method `persisted?' for []:Array

I want to monkeypatch to fix this problem. First of all: what is it supposed to look like? I know very little about the nesting of the Array class in Ruby's source code. I'd appreciate the guidance.

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只等公子 2024-10-09 16:51:00

基本上，您只需像编写任何其他类一样编写类和函数，然后将其添加到原始类定义中。

像这样：

class Array
    def persisted?
        # Does it persist?
    end
end

basically you just write the class and function like you would for any other class and it gets added to the original class definition.

Like So:

class Array
    def persisted?
        # Does it persist?
    end
end

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御弟哥哥 2024-10-09 16:51:00

猴子修补看起来像这样：

# patches/array.rb
class Array # Array is a top-level class
  def persisted?
    false # or your own implementation
  end
end

# some/other/script.rb
require 'path/to/patches/array.rb'
my_array = [1, 2, 3]
puts my_array.persisted?

现在：询问 Array 实例是否持久化可能意味着什么？

Monkey-patching looks like this:

# patches/array.rb
class Array # Array is a top-level class
  def persisted?
    false # or your own implementation
  end
end

# some/other/script.rb
require 'path/to/patches/array.rb'
my_array = [1, 2, 3]
puts my_array.persisted?

Now: what can you possibly mean by asking an Array instance whether it is persisted?

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