两个单表继承模型之间的关系

发布于 2024-08-15 11:56:54 字数 416 浏览 5 评论 0原文

我有以下两个模型

class ContactField < ActiveRecord::Base
end

class Address < ContactField
end

class Phone < ContactField
end

，

class Contact < ActiveRecord::Base
end

class Company < Contact
end

class Person < Contact
end

我想要一个联系人，无论是公司还是个人，都有很多ContactFields（地址和电话）...那么我应该把这些有很多和放在哪里>属于？谢谢

原文

I have the following two models

class ContactField < ActiveRecord::Base
end

class Address < ContactField
end

class Phone < ContactField
end

and

class Contact < ActiveRecord::Base
end

class Company < Contact
end

class Person < Contact
end

I want one contact, no matter is it Company or Person, to have many ContactFields(Addresses and Phones)... So where should I put those has many and belongs to?
Thanks

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毁梦 2024-08-22 11:56:54

你已经用简单的英语说过了:-)

我想要一个联系人，无论是公司还是个人，都有很多ContactFields（地址和电话）...那么我应该把那些有很多且属于的字段放在哪里呢？谢谢

class Contact < ActiveRecord::Base
 has_many :contact_fields
end

class ContactField < ActiveRecord::Base
 belongs_to :contact
end

，此关系将由地址和电话继承

You already said it in plain english :-)

I want one contact, no matter is it Company or Person, to have many ContactFields(Addresses and Phones)... So where should I put those has many and belongs to? Thanks

class Contact < ActiveRecord::Base
 has_many :contact_fields
end

class ContactField < ActiveRecord::Base
 belongs_to :contact
end

This Relationship will be inherited by both address and phone

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笛声青案梦长安 2024-08-22 11:56:54

看起来您正在描述一种归属关系。关联应该在父类中定义，以便子类可以继承它们。

class ContactField < ActiveRecord::Base
  belongs_to :contact
  belongs_to :company, :foreign_key => :contact_id
  belongs_to :person, :foreign_key => :contact_id
end

class Contact < ActiveRecord::Base
  has_many :contact_fields
  has_many :addresses
  has_many :phones
end

但是@contact.contact_fields只会返回ContactField记录。如果您需要任何子类中定义的方法，您始终可以使用变成方法。有几种方法可以解决这个问题。像我一样添加额外的关联。或者使用 ActiveRecord::Base#becomes

Looks like you're describing a belongs to relationship. The associations should be defined in the parent class, so they can be inherited by the subclasses.

class ContactField < ActiveRecord::Base
  belongs_to :contact
  belongs_to :company, :foreign_key => :contact_id
  belongs_to :person, :foreign_key => :contact_id
end

class Contact < ActiveRecord::Base
  has_many :contact_fields
  has_many :addresses
  has_many :phones
end

However @contact.contact_fields will just return ContactField records. If you need the methods defined in any of the sub classes you can always use the becomes method. There are a few ways around that. Such adding the extra associations, like I did. Or using ActiveRecord::Base#becomes

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