如何在子类中使用HTTParty方法?

我正在尝试用Ruby编写API包装器,但我对如何从子类调用HTTParty方法感到困惑。

我希望用户创建到API的连接,然后能够从子类查询结果。

module ApiWrapper
  class Connection
    include HTTParty
    base_uri '...'

    def initialize( u, p )
      ...
    end

    def contacts
      ApiWrapper::Contact
    end
  end
end

module ApiWrapper
  class Contact
    def all
      # issue httparty get request here that is created from the Connection class
    end
  end
end


## The user would do this
conn = ApiWrapper::Connection.new( 'username', 'password' )
contacts = conn.contacts.all