Assign klass to defined_traits to pass it's class to ActiveSuport::Notifications

[makicamel]

#1587 published factory_bot.compile_factory notification.
That maked to be able tracking the attributes and traits, e.g. thoughtbot/factory_bot_rails#419 .
But when using trait the payload has no class, so assign definition's class to defined_traits.

Fix thoughtbot/factory_bot_rails#431

[olleolleolle]

All of my factories did work with this change, except

FactoryBot.define do
  trait :base_deposit_trait do
    amount { 1.5 }
    currency { "SEK" }
    deposited_at { Time.now }
    transaction_id { "123" }
    organization { FactoryBot.create(:organization) }
  end

  factory :foo_deposit, traits: %i[ base_deposit_trait ] do
    type { "FooDeposit" }
  end

  factory :bar_deposit, traits: %i[ base_deposit_trait ] do
    type { "BarDeposit" }
  end

  factory :baz_deposit, traits: %i[ base_deposit_trait ] do
    type { "BazDeposit" }
  end
end

...and this failed with the NoMethodError: undefined method '<' for nil:NilClass error.

[pauljacksonrodgers]

I am also seeing the same regression NoMethodError: undefined method '<' for nil:NilClass for some of my factories in the latest release.

[mike-burns]

Released in 6.4.1. Thank you for tracking that down!