Created
July 10, 2018 17:49
-
-
Save jturkel/c46e0297478c9acc2bc177d496009877 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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', '~> 5.2.0' # Fails with '~> 5.1.0' | |
| gem 'sqlite3', '1.3.12' | |
| gem 'goldiloader' | |
| end | |
| require 'active_record' | |
| require 'minitest/autorun' | |
| require 'logger' | |
| puts "Using ActiveRecord #{ActiveRecord::VERSION::STRING}" | |
| # Ensure backward compatibility with Minitest 4 | |
| Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test) | |
| ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:') | |
| ActiveRecord::Base.logger = Logger.new(STDOUT) | |
| # Schema | |
| ActiveRecord::Schema.define do | |
| ActiveRecord::Base.connection.create_table(:groups) do |t| | |
| end | |
| ActiveRecord::Base.connection.create_table(:users) do |t| | |
| t.integer :group_id | |
| end | |
| ActiveRecord::Base.connection.create_table(:posts) do |t| | |
| t.integer :user_id | |
| t.string :type | |
| end | |
| end | |
| # Models | |
| class Group < ActiveRecord::Base | |
| has_many :users | |
| has_many :articles, through: :users | |
| end | |
| class User < ActiveRecord::Base | |
| belongs_to :group | |
| has_many :articles | |
| end | |
| class Post < ActiveRecord::Base | |
| belongs_to :user | |
| end | |
| class Article < Post | |
| end | |
| class BugTest < Minitest::Test | |
| def test_bug | |
| group = Group.create! | |
| user = group.users.create! | |
| article1 = user.articles.create! | |
| article2 = user.articles.create! | |
| post = Post.create!(user: user) | |
| # Explicit eager loading | |
| articles = Group.includes(:articles).flat_map(&:articles).sort_by(&:id) | |
| assert_equal([article1, article2], articles) | |
| # Automatic eager loading | |
| articles = Group.all.flat_map(&:articles).sort_by(&:id) | |
| assert_equal([article1, article2], articles) | |
| end | |
| end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment