Ruby inline standalone script

bug.rb

# frozen_string_literal: true

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem 'rails', '~> 7.0.5'
  gem 'debug'
  gem 'sqlite3'
end

require 'active_record'
require 'active_support/testing/assertions'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :appointments, force: true do |t|
    t.boolean :paid, default: false
  end

  create_table :payments, force: true do |t|
    t.references :appointment
  end
end

class Appointment < ActiveRecord::Base
  has_one :payment, dependent: :destroy

  after_create do
    logger.debug :ensure_payment
    create_payment
  end
end

class Payment < ActiveRecord::Base
  belongs_to :appointment

  before_create do
    logger.debug :create_intent
    appointment.assign_attributes paid: true
    appointment.save validate: false
  end
end

class BugTest < Minitest::Test
  include ActiveSupport::Testing::Assertions

  def test_bug
    assert_difference 'Payment.count', 1 do
      Appointment.create!
    end
  end
end