在不同类中共享变量Ruby

Question

我想要一个主类，里面有一些我想在其他类中调用的变量。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。做这个的最好方式是什么？

Answer 1

最好的办法是从AwsS3Initalization像继承其他类：

class Foo < AwsS3Initalization 
end 

class Bar < AwsS3Initalization 
end 

然后，你将能够访问来自父类的所有变量到子类。

UPDATE

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