如何在ActionMailer :: Preview中使用FactoryBot

Question

我曾经有以下

require 'factory_girl'
require_relative '../../support/factories/users.rb'

class UserMailerPreview < ActionMailer::Preview
  def invitation
    user = FactoryGirl.build(:user)
    UserMailer.invitation(user)
  end
end

它正在使用FactoryGirl 4.8

现在，我已更新为FactoryBot 4.8.2

    require 'factory_bot'
    require_relative '../../support/factories/users.rb'

    class UserMailerPreview < ActionMailer::Preview
      def invitation
        user = FactoryBot.build(:user)
        UserMailer.invitation(user)
      end
    end

但我得No such file to load -- factory_bot.rb。我应该要求什么？

感谢您的帮助。