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 'arel', github: 'rails/arel' gem 'rack', github: 'rack/rack' gem 'sprockets', github: 'rails/sprockets' gem 'sprockets-rails', github: 'rails/sprockets-rails' gem 'sass-rails', github: 'rails/sass-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| 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 end class BugTest < Minitest::Test def test_association_stuff post = Post.create! post.comments << Comment.create! assert_equal 1, post.comments.count assert_equal 1, Comment.count assert_equal post.id, Comment.first.post.id end end