ruby:如何在本地上下文中加载.rb文件 [英] ruby: how to load .rb file in the local context

问题描述

如何在Ruby中完成此简单任务?
我有一些简单的配置文件

How this simple task can be done in Ruby?
I have some simple config file

=== config.rb
config = { 'var' => 'val' }

我想从main.rb文件中定义的某种方法中加载配置文件，以使config.rb中的局部变量成为该方法的局部变量.
像这样:

I want to load config file from some method, defined in main.rb file so that the local variables from config.rb became local vars of that method.
Something like this:

=== main.rb
Class App
    def loader
        load('config.rb') # or smth like that
        p config['var']   # => "val"
    end
end

我知道我可以在config.rb中使用全局变量，然后在完成后取消定义它们，但我希望有一个红宝石方法)

I know that i can use global vars in config.rb and then undefine them when done, but i hope there's a ruby way )

推荐答案

您当然可以使用eval和File.read破解一个解决方案，但是事实很难，这会向您发出一个信号，表明它不像红宝石一样解决您遇到的问题的方法.两种替代设计是将yaml用于您的配置api，或定义一个简单的dsl.

You certainly could hack out a solution using eval and File.read, but the fact this is hard should give you a signal that this is not a ruby-like way to solve the problem you have. Two alternative designs would be using yaml for your config api, or defining a simple dsl.

YAML情况最简单，您只需在main.rb中输入以下内容:

The YAML case is the easiest, you'd simply have something like this in main.rb:

Class App
  def loader
      config = YAML.load('config.yml')
      p config['var']   # => "val"
  end
end

，您的配置文件如下所示:

and your config file would look like:

--- 
var: val

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