Single file Rails application

another_example.rb

# Activate the gem you are reporting the issue against.
gem 'activerecord'
require 'active_record'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# 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 :name
  end

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

module Blog
  class Post < ActiveRecord::Base
    has_many :comments
  end

  class Comment < ActiveRecord::Base
    belongs_to :post
  end
end

class BugTest < Minitest::Test
  def test_association_stuff
    post = Blog::Post.create(name: "test")

    assert_equal nil, post.comments.take
    post.comments.to_a
    assert_equal nil, post.comments.take
  end
end

application.rb

# the new and improved one-file rails app -- now including 

require "action_controller/railtie"

class Tester < Rails::Application
  config.session_store :cookie_store, :key => '_rails_session'
  config.secret_token = '095f674153982a9ce59914b561f4522a'
end

class UsersController < ActionController::Base
  def current
    render text: current_user.server_id
  end

  def create
    @u = User.create(params[:user])
    @u.create_remotely!
    session[:user_id] = @u.id
    render text: "good!"
  end
end

require 'sqlite3'
db_file = File.join(File.dirname(__FILE__), 'test.sqlite3')
db = SQLite3::Database.new( db_file )
db.execute( "drop table users;" ) rescue nil # maybe it didn't exist!
db.execute( "create table users (id integer primary key autoincrement, email varchar(100), server_id integer);" )
require 'active_record'
ActiveRecord::Base.establish_connection(:adapter  => 'sqlite3', :database => db_file)

class User < ActiveRecord::Base
  include Whoami::Rails::ActiveRecord
end

Tester.routes.draw do
  root to: 'users#current'
  match '/users/current' => 'users#current'
  resources :users
end

config.ru

require './application'
run Tester