require "factory_bot" # In test and dev this is automatically called by factory_bot_rails after initialize, don't call it again FactoryBot.find_definitions unless Rails.env.test? || Rails.env.development? class ApplicationMailerPreview < ActionMailer::Preview include FactoryBot::Syntax::Methods # Avoid saving data created for mailer previews. def self.call(...) message = nil ActiveRecord::Base.transaction do message = super(...) raise ActiveRecord::Rollback end message end end