gistfile1.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails'
    gem 'arel'
    gem 'rack'
    gem 'i18n'
    gem 'sqlite3'
    gem 'destroyed_at'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'
require 'destroyed_at'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.datetime :destroyed_at
  end

  create_table :comments do |t|
    t.integer :post_id
    t.datetime :destroyed_at
  end

  create_table :post_data do |t|
    t.integer :post_id
    t.datetime :destroyed_at
  end
end

class Post < ActiveRecord::Base
  include DestroyedAt

  has_many :comments, dependent: :restrict_with_error
  has_one :post_datum, inverse_of: :post, dependent: :destroy
end

class Comment < ActiveRecord::Base
  include DestroyedAt

  belongs_to :post
end

class PostDatum < ActiveRecord::Base
  include DestroyedAt

  belongs_to :post
end

class BugTest < Minitest::Test
  def test_association_stuff
    Post.create!(post_datum: PostDatum.create!)

    Post.last.destroy
  end
end