autosave testcase

autosave_testcase.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"
  gem "rails", github: 'rails/rails'
  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|
    t.string :title
  end

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

class Post < ActiveRecord::Base
  has_many :comments, autosave: true
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

class BugTest < Minitest::Test
  def test_autosave_with_bracket
    post = Post.create(title: 'ruby rocks')
    post.comments.create(body: 'hello world')
    post.comments[0].body = 'hi everyone'
    post.comments.build(body: "good morning.")
    post.title += "!"
    post.save
    assert_equal 'hi everyone', post.reload.comments.first.body
    assert_equal 'good morning.', post.reload.comments.second.body
    assert_equal 'ruby rocks!', post.title
  end

  def test_autosave_first
    post = Post.create(title: 'ruby rocks')
    post.comments.create(body: 'hello world')
    post.comments.first.body = 'hi everyone' # that's only different
    post.comments.build(body: "good morning.")
    post.title += "!"
    post.save
    assert_equal 'hi everyone', post.reload.comments.first.body # fail!
    assert_equal 'good morning.', post.reload.comments.second.body
    assert_equal 'ruby rocks!', post.title
  end
end