STI will not pick up custom generator

[equivalent]

This works:

Foo < ActiveRecord::Base
     generate_public_uid generator: PublicUid::Generators::HexStringSecureRandom.new(50)
end

foo = Foo.new
foo.save!
foo.public_uid.length # => 50

this wil not

```ruby
Bar <Foo
end

foo = Foo.new
foo.save!
foo.public_uid.length # => 8

due to https://github.com/equivalent/public_uid/blob/master/lib/public_uid/model.rb#L25 instance method set the config is not copied across inheritance which is bad in this case

possible solution: use class variables @@generator =

[equivalent]

🤔 or inherited hook will be more OOP way https://www.sitepoint.com/rubys-important-hook-methods/

update

on second tought that causes lot of errors on Rails as Rails does some weird reloads on inheritance