Single file rails application

touch_corrupting_lcok_version.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
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 :posts, force: true  do |t|
    t.string :title
    t.integer :lock_version, default: 0
    t.timestamps
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class BugTest < Minitest::Test
  def test_association_stuff
    post = Post.create!(title: 'Original Title')
    post_copy = Post.find(post.id)
    post.update!(title: 'New Title')
    post.update!(title: 'Another New Title')
    post_version = post.lock_version
    # This line should probably raise ActiveRecord::StaleObjectError,
    # but does not.
    post_copy.touch
    # And, surely, the lock_version should never go backwards.
    assert post.reload.lock_version >= post_version
  end
end