NameError on start of rspec spec with fresh Rails 8 app

[itsterry]

Description

Running "bundle exec rspec spec" on a brand new Rails 8 app gives NameError: uninitialized constant FactoryBotRails::Railtie::FactoryBot

Reproduction Steps

gem install rails --pre # 8.0.0-rc2 at time of writing
rails g new myapp 

Edit Gemfile to look like this:

source "https://rubygems.org"

gem 'acts_as_list'
gem 'acts-as-taggable-on'
gem 'after_party'
gem 'ancestry'
gem 'aws-partitions'
gem 'aws-sdk-core'
gem 'aws-sdk-s3'

gem "bcrypt", "~> 3.1.7"
gem 'better_errors'
gem 'binding_of_caller'
gem "bootsnap", require: false
gem "brakeman", require: false, groups: %i[development test]

gem 'capistrano'
gem "cssbundling-rails"

gem "debug", platforms: %i[ mri windows ], require: "debug/prelude", groups: %i[development test]
gem 'decent_exposure'

gem 'factory_bot_rails', groups: %i[development test]
gem 'faker'
gem 'faraday_middleware-aws-sigv4'
gem 'friendly_id'

gem 'guard-rspec', groups: [:test]
gem 'guard-rubocop', groups: [:test]

gem "image_processing", "~> 1.2"

gem "jbuilder"
gem "jsbundling-rails"

gem "kamal", require: false

gem 'letter_opener', group: :development

gem 'morse_spec_helpers', groups: [:development]
gem "mysql2", "~> 0.5"

gem 'net-imap'
gem 'net-pop'
gem 'net-smtp'
gem 'net-ssh'

gem 'overcommit', groups: [:development]

gem "propshaft"
gem "puma", ">= 5.0"

gem 'rack-attack'
gem "rails", "~> 8.0.0.rc2"
gem 'ransack'
gem 'recaptcha'
gem 'rest-client'
gem 'rollbar'
gem 'rspec-rails', groups: %i[development test]
gem 'rubocop-rspec', groups: [:test]
gem "rubocop-rails-omakase", require: false, groups: %i[development test]

gem 'shoulda-matchers', groups: [:test]
gem 'simple_form'
gem 'simplecov', groups: [:test]
gem "solid_cable"
gem "solid_cache"
gem "solid_queue"
gem 'spring', groups: %i[developmen test]
gem 'spring-commands-rspec', groups: [:test]
gem "stimulus-rails"

gem "thruster", require: false
gem "turbo-rails"
gem "tzinfo-data", platforms: %i[ windows jruby ]

gem "web-console", group: :development 
gem 'whenever'
gem 'workflow-activerecord'

bundle install

rails g rspec:install

spec/rails_helper should look like this:
(I've removed comments for clarity)

require 'spec_helper'
ENV['RAILS_ENV'] ||= 'test'
require_relative '../config/environment'
abort("The Rails environment is running in production mode!") if Rails.env.production?
require 'rspec/rails'
require 'factory_bot_rails'

begin
  ActiveRecord::Migration.maintain_test_schema!
rescue ActiveRecord::PendingMigrationError => e
  abort e.to_s.strip
end
RSpec.configure do |config|
  config.fixture_paths = [
    Rails.root.join('spec/fixtures')
  ]
  config.use_transactional_fixtures = true
  config.infer_spec_type_from_file_location!
  config.filter_rails_from_backtrace!
end

bundle exec rspec spec

Expected behavior

The test suite runs without error (even though there are no tests yet)

Actual behavior

An error occurred while loading rails_helper.
Failure/Error: require_relative '../config/environment'

NameError:
  uninitialized constant FactoryBotRails::Railtie::FactoryBot
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/factory_bot_rails-6.4.4/lib/factory_bot_rails/railtie.rb:12:in `<class:Railtie>'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/factory_bot_rails-6.4.4/lib/factory_bot_rails/railtie.rb:10:in `<module:FactoryBotRails>'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/factory_bot_rails-6.4.4/lib/factory_bot_rails/railtie.rb:9:in `<main>'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/zeitwerk-2.7.1/lib/zeitwerk/core_ext/kernel.rb:34:in `require'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/factory_bot_rails-6.4.4/lib/factory_bot_rails.rb:1:in `<main>'
# /Users/terry/.rvm/gems/ruby-3.3.5/gems/zeitwerk-2.7.1/lib/zeitwerk/core_ext/kernel.rb:34:in `require'
# ./config/application.rb:19:in `<top (required)>'
# ./config/environment.rb:2:in `require_relative'
# ./config/environment.rb:2:in `<top (required)>'
# ./spec/rails_helper.rb:4:in `require_relative'
# ./spec/rails_helper.rb:4:in `<top (required)>'

System configuration

factory_bot_rails version: 6.4.4
factory_bot version: 6.5.0
rails version: 8.0.0-rc2
ruby version: 3.3.5

Additional thoughts

This feels like it may be an order-of-loading issue, possibly down to the edge Rails version, but I figured it was worth raising it anyway

[itsterry]

Observation: I can make this error go away if:

1. I use the factory_bot gem rather than factory_bot_rails; AND
2. I change any files that reference the FactoryBot class to have a filename that's alphabetically after rails_helper.rb