Test case for rails/rails #28536

test_association_save.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" }

  gem "rails", github: "rails/rails"
  gem "arel", github: "rails/arel"
  gem "sqlite3"
end

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|
  end

  create_table :comments, force: true do |t|
    t.integer :post_id
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post

  before_create do
    throw(:abort)
  end
end

class BugTest < Minitest::Test
  def setup
    Post.delete_all
    Comment.delete_all
  end

  def test_saving_on_an_existing_record
    post = Post.create!
    comment = post.comments.build
    post.save
    assert_equal 0, Comment.count
    assert_equal 0, Post.count # fails
  end

  def test_saving_on_a_new_record
    post = Post.new
    comment = post.comments.build
    post.save
    assert_equal 0, Comment.count
    assert_equal 0, Post.count # fails
  end

  def test_saving_bang_on_a_new_record
    post = Post.new
    comment = post.comments.build
    post.save!
    assert_equal 0, Comment.count
    assert_equal 0, Post.count # fails
  end

  def test_saving_bang_on_comment_with_a_new_post
    post = Post.new
    comment = post.comments.build
    assert_raises ActiveRecord::RecordNotSaved do
      comment.save!
    end
    assert_equal 0, Comment.count
    assert_equal 0, Post.count
  end

  def test_saving_bang_with_transaction
    assert_raises ActiveRecord::RecordNotSaved do
      ActiveRecord::Base.transaction do
        post = Post.create!
        comment = post.comments.build
        comment.save!
      end
    end
    assert_equal 0, Comment.count
    assert_equal 0, Post.count
  end
end