Why polymorphic association doesn't work for STI if type column of the polymorphic association doesn't point to the base model of STI?

Question

I have a case of polymorphic association and STI here.

# app/models/car.rb
class Car < ActiveRecord::Base
  belongs_to :borrowable, :polymorphic => tru         


        

Answer 1

There is a gem. https://github.com/appfolio/store_base_sti_class

Tested and it works on various versions of AR.