恼人的“警告：已经初始化的常数”的解决方案。信息 [英] solutions to the annoying "warning: already initialized constant" message

问题描述

今天，我偶然发现了一个有关Ruby常量的棘手问题。在我们的团队中，有人创建了一个模块，该模块包含在多个模型中。在我们的（规范）测试输出中，这导致生成警告消息，例如：

Today I've stumbled upon a tricky issue with Ruby constants. In our team someone created a module, which is included into multiple models. In our (spec) test output this results into warning messages such as:

/home/ayrton/project/lib/life_cycle.rb： 5：警告：已经初始化的
常量RESET

/home/ayrton/project/lib/life_cycle.rb:5: warning: already initialized constant RESET

一种解决方法是，像这样声明您的常量：

One way to solve this is, is to declare your constants like this:

module LifeCycle

  unless (const_defined?(:RESET))
    RESET = 'reset'
  end

  #...
end

我还阅读了Avdi Grimm撰写的博客文章，其中提供了另一种方法解决方案，我想知道您对此事有何看法。

I've also read a blog post, written by Avdi Grimm, which provides an alternative solution, I was wondering what your opinions are, regarding this matter.

推荐答案

我今天遇到了同样的问题，找到了一个简单的解决方案。

I encountered this same problem today and found a simple solution.

由于警告是试图重新分配具有相同值的常量，因此我只是更改了

Since the warning is from trying to reassign a constant with its same value, I just changed

module LifeCycle
  RESET = 'reset'
end

至

module LifeCycle
  RESET ||= 'reset'
end

这很注意警告，并且比检查是否定义了每个常量要简单得多。让我知道您是否找到更好的解决方案。

This took care of the warning and is a lot simpler than checking if each constant is defined. Let me know if you find a better solution.

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