Change creation strategy in FactoryBot

I found out that's possible to change the FactoryBot strategy by invoking the to_create method inside the factory definition.

We had to do that to make factory bot linting to work on a factory that acts like an enum. So we did something like this:

FactoryBot.define do
  factory :role do
    to_create do |instance|
      instance.attributes = instance.class
        .create_with(instance.attributes)
        .find_or_create_by(slug: instance.slug)
        .attributes

      instance.instance_variable_set(:@new_record, false)
    end
  end
end

The said part here is that FactoryBot expects us to mutate that instance in order to work.