在 RoR 中引用同一个表的多个外键 [英] Multiple foreign keys referencing the same table in RoR

问题描述

我希望客户引用两种地址模型，一种用于帐单地址，另一种用于送货地址.据我了解，外键由其名称决定，如_id.显然我不能命名两行 address_id (引用地址表).我该怎么做?

I want a Customer to reference two Address models, one for the billing address and one for the shipping address. As I understand it, the foreign key is determined by its name, as _id. Obviously I can't name two rows address_id (to reference the Address table). How would I do this?

create_table :customers do |t|
  t.integer :address_id
  t.integer :address_id_1 # how do i make this reference addresses table?
  # other attributes not shown
end

推荐答案

这对我来说听起来像是 has_many 关系 - 将 customer_id 放在 Address 表中.

This sounds like a has_many relationship to me - put the customer_id in the Address table instead.

Customer
  has_many :addresses

Address
  belongs_to :customer

您还可以在关联声明中提供外键和类

You can also provide a foreign key and class in the assoc declaration

Customer
   has_one :address
   has_one :other_address, foreign_key => "address_id_2", class_name => "Address"

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