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Ruby Active Record Associations in Rails More Association Options Polymorphic "Belongs To" Associations

Update the Part model class so that each instance belongs to a "vehicle".

Not sure were the error is occurring, I attempting using the has_many, and other combination to develop the association, yet I am missing something.

class Part < ApplicationRecord
  belongs_to :vehicle as: :Cars;
  belongs_to :vehicle as: :Trucks;

belongs_to :vehicle, polymorphic: true