Rails与使用它的多个属性进行多态关联

Question

I have Address class which I need to use in multiple other models and in some models I need to use it for multiple attributes. The setup I made so far:

class User
  has_one :pickup_address,   class_name: 'Address', as: :location, dependent: :destroy
  has_one :delivery_address, class_name: 'Address', as: :location, dependent: :destroy   
end

class Address
  belongs_to :location, polymorphic: true
end

The Address class will also be used in other models later, like:

class ServiceProvider
  has_one :address, as: :location
end

The Problem I have now is with class User, as it has multiple attributes using the same polymorphic Address model. When building model it allows to set up both pickup and delivery addresses, but after saving, when I'm trying to fetch it from db, both fields have the same (latter) address object which was intended for delivery_address.

As far as I understand this happens, because a model is saving only one polymorphic id instead of multiple.

My question is how such associations should be handled properly? I think this is pretty common problem in web development?!

Answer 1

I think in your user model you should use belongs_to :

belongs_to :pickup_address, :class_name => "Address", :foreign_key => "pickup_address_id"
belongs_to :delivery_address, :class_name => "Address", :foreign_key => "delivery_address_id"

It means, that id's of addresses will be stored in users table.