自我参照关联与多态关联

Question

I have a User and Address models. A user may have many addresses and one as default. I currently use this that works

# User.rb
belongs_to :default_address, class_name: "Address", foreign_key: :default_address_id

Now I made the Address belongs_to :addressable, polymorphic: true .

My question is how to tell this default_address self association to use the addressable instead of going directly to the Address class

Answer 1

Solved using has_one instead of belongs_to on User.rb

has_one :default_address, class_name: "Address", as: :addressable, dependent: :destroy
accepts_nested_attributes_for :default_address