Rails：belongs_to特定列

Question

我有以下型号：

class User < ActiveRecord::Base

  #method that I want to delete and replace with belongs_to
  def restaurant
      RemoteRestaurant.find_by_shortRD(self.INFO_SHORT_RD)
  end
end

在这种情况下如何添加belongs_to：remote_restaurant？

Answer 1

使用您的自定义foreign_key和primary_key

添加belongs_to

class User < ActiveRecord::Base
    belongs_to :remote_restaurant, :foreign_key => "INFO_SHORT_RD", :primary_key=>"shortRD"
end

Answer 2

class User < ActiveRecord::Base
  belongs_to :restaurant, class_name: 'RemoteRestaurant', foreign_key: :shortRD, primary_key: :INFO_SHORT_KEY
end