Rails foreign_key 不是 id

Question

我有两张桌子

class Sku < ApplicationRecord
  validates :sku, :supplier_code, :name, :price, presence: true
  belongs_to :supplier, class_name: 'Supplier', foreign_key: 'code'
end

和

 class Supplier < ApplicationRecord
  validates :code, :name, presence: true
  has_many :skies, class_name: 'Sku'
end

我将foreign_key 设置为code 字段

但是当我尝试用我设置为供应商的supplier_code 创建sku 时

Supplier.create(code:4,name:2) => OK

我有一个错误{:supplier=>[{:error=>:blank}]},

Sku.create(name:2,price:2,sku:3,supplier_code:4).errors

Answer 1

您必须需要在另一个模型上定义

class Sku < ApplicationRecord
  validates :sku, :supplier_code, :name, :price, presence: true
  belongs_to :supplier, class_name: 'Supplier', foreign_key: 'code'
end

和

class Supplier < ApplicationRecord
  validates :code, :name, presence: true
  has_many :skies, class_name: 'Sku', primary_key: 'id', foreign_key: 'code'
end