跨不同类共享变量Ruby

Question

我希望有一个主类，在它里面有一些变量，我想在其他类中调用这些变量。例如：

class AwsS3Initalization
  attr_reader :resource, :client

  def initialize resource, client
    @resource = resource
    @client = client
    # Where do I define those variables below? I think this is not the right place to put them
    @resource = Aws::S3::Resource.new(region: 'region', access_key_id: 'my-key', secret_access_key: 'secret-key')
    @client = Aws::S3::Client.new(region: 'region', access_key_id: 'my-key', secret_access_key: 'secret-key')
  end
end

我希望能够在我拥有的其他类中调用@resource和@client。做这件事最好的方法是什么？

Answer 1

最好的方法是从AwsS3Initalization继承其他类，例如：

class Foo < AwsS3Initalization
end

class Bar < AwsS3Initalization
end

然后，您将能够访问从父类到子类的所有变量。

更新

class AwsS3Initialization
  ACCESS_KEY = <read-from-yml>
  SECRET_KEY = <read-from-yml>

  def self.resource
    Aws::S3::Resource.new(...)
  end

  def self.client
    Aws::S3::Client.new(...)
  end
end