Rollback loop

rollback_test.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', path: '../rails'
    gem 'arel', '~> 5.0.0'
    gem 'rack', '~> 1.5.2'
    gem 'i18n', github: 'svenfuchs/i18n'
    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 :orders do |t|
  end

  create_table :payments do |t|
    t.integer :order_id
  end
end

class Order < ActiveRecord::Base
  has_many :payments
end

class Payment < ActiveRecord::Base
  belongs_to :order, touch: true

  after_rollback :persist_invalid

  attr_reader :rolled

  def persist_invalid
    @rolled = true
    save
  end
end

class BugTest < Minitest::Test
  def test_rollback_save
    Payment.connection.begin_transaction joinable: false
    payment = Payment.create order: Order.create
    Payment.connection.rollback_transaction

    assert payment.rolled
  end
end