Ruby父对象可以访问子属性

So I am wondering if there is a better way of doing this. I have a parent class that has three 1 to 1 relationships, children.

所以我想知道是否有更好的方法来做到这一点。我有一个父类，有三个1对1的关系，孩子。

class Parent
  has_one :child_one
  has_one :child_two
  has_one :child_three
...
end

Then within each child object I state belongs_to :parent, now ChildOne has attribute1, attribute2, ..., attribute30 etc.

然后在每个子对象中我声明belongs_to：parent，现在ChildOne有attribute1，attribute2，...，attribute30等。

I am using a gem that uses yaml to build calculations, but it can only access the table or model of the Parent class. It means that all the attributes i need from the ChildOne class I'll have to pull like this

我正在使用一个使用yaml构建计算的gem，但它只能访问Parent类的表或模型。这意味着我需要从ChildOne类中获取所有属性，我必须像这样

def calculation_one
  cal_one = self.child_one.attribute1
end

and onward. This would mean that I would have a model that's freakin fat just linking children attributes. Is there a better way of doing this?

然后继续这意味着我会有一个只是链接儿童属性的模型。有更好的方法吗？

Update

更新

What i am looking for is a way to basically attr_accessor a subclass?

我正在寻找的是一种基本上attr_accessor子类的方法？

class Parent
  attr_accessor :child_one, :attribute1
end

person = Parent.new
person.attribute1 = "awesome"
person.attribute1 # => "awesome"

1 个解决方案

#1

I think what you're looking for is the Delegate module in rails : you can call delegate to let a related model respond to a method call like that :

我认为你要找的是rails中的Delegate模块：你可以调用delegate让相关模型响应方法调用：

class Parent < ActiveRecord::Base
  has_one :child_one
  delegate :attribute1, to: :child_one
end

Full documentation : http://apidock.com/rails/Module/delegate

完整文档：http：//apidock.com/rails/Module/delegate

#1