Additional executable test for Rails issue #32940

activerecord_executable_test_32940-2.rb

# frozen_string_literal: true

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"

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

  # Activate the gem you are reporting the issue against.
  gem "activerecord", "5.2.0"
  gem "sqlite3"
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 :subsets, force: true do |t|
  end

  create_table :items, force: true do |t|
  end

  create_table :subset_items, force: true do |t|
    t.references :subset, foreign_key: true
    t.references :item, foreign_key: true
  end
end

class Subset < ApplicationRecord::Base
  has_many :subset_items
end

class Item < ApplicationRecord::Base
  has_many :subset_items
end

class SubsetItem < ApplicationRecord::Base
  belongs_to :item
  belongs_to :subset
  validates :item_id, uniqueness: { scope: [:subset_id] }
end

class BugTest < Minitest::Test
  def test_save_with_scoped_duplicates_fails
    item = Item.create
    subset = Subset.new(subset_items: [SubsetItem.new(item_id: item.id), SubsetItem.new(item_id: item.id)])

    assert_not subset.save
    assert_predicate subset.errors, :any?
    assert_equal 0, Subset.count
    assert_equal 0, SubsetItem.count
  end
end