Paranoia

bug.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  # Activate the gem you are reporting the issue against.
  gem 'activerecord', '4.2.0'
  gem 'sqlite3'
  gem 'paranoia'
end

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

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# 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 :invoices, force: true do |t|
  end

  create_table :lines, force: true do |t|
    t.integer :invoice_id
    t.integer :product_id
  end

  create_table :products, force: true do |t|
    t.datetime :deleted_at
  end
end

class Invoice < ActiveRecord::Base
  has_many :lines
end

class Line < ActiveRecord::Base
  belongs_to :invoice
  belongs_to :product, ->{with_deleted}
end

class Product < ActiveRecord::Base
  acts_as_paranoid
end

class BugTest < Minitest::Test
  def test_association_stuff
    # Create the invoice with the line linked on the product that will be deleted
    invoice = Invoice.create!
    product = Product.create!
    invoice.lines.create! product: product

    assert_equal 1, invoice.lines.count

    # Delete the product
    product.destroy!

    # Use with `includes`
    assert_equal product, Invoice.includes(lines: :product).last.lines.last.product
  end
end