insert_returning_bug_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 '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 'pg'
end

require 'active_record'
require 'minitest/autorun'
require 'logger'

# 
ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'test',insert_returning: false)
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do

  create_table :users, force: true  do |t|
    t.string :name
  end

  create_table :profiles, force: true  do |t|
    t.integer :user_id
  end
end

class User < ActiveRecord::Base
  has_one :profile

  after_save do |user|
    user.create_profile
  end

end

class Profile < ActiveRecord::Base
  belongs_to :user
end

class BugTest < Minitest::Test
  def test_association
    user = User.create()
    assert Profile.first.user_id
  end
end