Question

我有两个类Book :: Utils，Table :: Utils，我从另一个类中调用一个不是父子类的类。

如果我从class1调用class2 - ＆gt;在class2中，我们可以访问已存在的class1实例变量吗？

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id
      # Here I want to access Table's instance variables
      # Like @account_id + 20
    end
  end
end

我打电话给Table::Utils.new({account_id: 1}).calculate

预期结果：21 我们可以做到这一点吗？

Answer 1

您需要传递需要调用的类的实例，然后才能使用访问器：

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id(self)
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id(table)
      table.account_id + 20
    end
  end
end

或只传递所需的值

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id(account_id)
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id(other_id)
      other_id + 20
    end
  end
end

Ruby - 调用被调用类的实例变量

1 个答案: