ref: https://qiita.com/suusan2go/items/6da23826523744a74ba3

inherit_by_enum.rb

module InheritByEnum
  extend ActiveSupport::Concern

  class_methods do
    def inherit_by_enum(**options)
      name, values = options.sole.to_a
      plural_name = name.to_s.pluralize

      self.inheritance_column = name

      enum **options

      define_method :find_sti_class do |value|
        value_key = values.key(value.to_i)
        "#{name}::#{value_key.to_s.camelize}".constantize
       end
   
      define_method :sti_name
        values[name.demodulize.underscore]
      end
    end
  end
end

class Book < ApplicationRecord
  inherit_by_enum status: { draft: 'draft', published: 'published' }
end

class Book::Draft < Book

end