Rails 3 抽象类与继承类

发布于 2024-10-19 19:46:08 字数 291 浏览 2 评论 0原文

在我的 Rails 3 模型中，我有两个类：产品、服务。我希望两者都是 InventoryItem 类型，因为我有另一个名为 Store 和 Store has_many :InventoryItems 的模型，

这就是我想要达到的目标，但我不确定如何在我的 InventoryItem 模型以及我的产品和服务中对此进行建模模型。 InventoryItem 应该只是 Product 和 Service 继承的父类，还是应该将 InventoryItem 建模为 Product 和 Service 扩展的类抽象。

预先感谢您的建议！

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放我走吧 2024-10-26 19:46:08

就我个人而言，我不会使用继承。你为什么不直接说

has_many :services
has_many :products

继承是相当昂贵的——无论是在运行时还是在可读性方面。这种情况听起来像是一个非常基本的情况，不需要继承。您真的希望产品和服务真正从基类继承某些东西吗？你所写的表明你只想建立关联。

Personally, I would not use inheritance. Why don't you just say

has_many :services
has_many :products

Inheritance is pretty expensive - both in terms of runtime and often in readability too. This case sounds like a very basic case for which no inheritance is required. Do you really want products and services to actually INHERIT something from a base class? What you writes indicates all you want is to establish the association.

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喜爱纠缠 2024-10-26 19:46:08

我两者都不会使用，并遵循 Mörre 建议将 InventoryItem 作为连接模型：

class Store
  has_many :inventory_items
  has_many :products, :services, :through => :inventory_items
end

class InventoryItem
  belongs_to :store
  belongs_to :products, :services
end

class Product
  has_many :inventory_items
  has_many :stores, :through => :inventory_items
end

class Service
  has_many :inventory_items
  has_many :stores, :through => :inventory_items
end

I'd use neither, and follow what Mörre suggested to have InventoryItem be a join model:

class Store
  has_many :inventory_items
  has_many :products, :services, :through => :inventory_items
end

class InventoryItem
  belongs_to :store
  belongs_to :products, :services
end

class Product
  has_many :inventory_items
  has_many :stores, :through => :inventory_items
end

class Service
  has_many :inventory_items
  has_many :stores, :through => :inventory_items
end

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