如何在rails中的ruby上的另一个文件中使用变量？

I'm trying to use my varialbe in all files of my program. this is an exemple of what I'm tring to do.

我正在尝试在我的程序的所有文件中使用我的varialbe。这是我要做的事情的一个例子。

 main.rb
 Class1
 def self.test1
 puts "class 1" if @@debug
  end
 end
 @@ debug = true

 class.test1
 class.test2

 class2.rb
 Class2
 def self.test2
 puts "test2" if @@debug
  end
 end

I really hope it's enough clear for the community, any help would be appreciated, thanks!

我真的希望它对社区来说足够清楚,任何帮助都会受到赞赏,谢谢!

2 个解决方案

#1

You want a global variable or constant. You could create your own, but Ruby conveniently comes with a builtin $DEBUG global variable. When you specify the -d option to ruby, $DEBUG will be true, and otherwise, false.

你想要一个全局变量或常量。你可以创建自己的,但Ruby方便地带有一个内置的$ DEBUG全局变量。为ruby指定-d选项时,$ DEBUG将为true,否则为false。

If the classes are in multiple files, put this in the file that includes the others:

如果类在多个文件中,请将其放在包含其他文件的文件中:

DEBUG=$DEBUG

And in the other files, use DEBUG for debug, rather than $DEBUG.

在其他文件中,使用DEBUG进行调试,而不是$ DEBUG。

#2

You can create a getter method to get class_variable

您可以创建一个getter方法来获取class_variable

def self.get_debug
  @@debug
end

rails however provides a method called cattr_accessor http://apidock.com/rails/Class/cattr_accessor This will allow you to set and get the class variable outside the class

rails然后提供了一个名为cattr_accessor的方法http://apidock.com/rails/Class/cattr_accessor这将允许你设置并获取类外的类变量

i.e. Class1.debug = false

即Class1.debug = false

#1