Ruby minimal script for bug reporting

bug_report.rb

# encoding: utf-8
# source http://www.jonathanleighton.com/articles/2011/awesome-active-record-bug-reports/

gem 'rails', '3.1.0' # change as required
require 'active_record'

# Print out what version we're running
puts "Active Record #{ActiveRecord::VERSION::STRING}"

# Connect to an in-memory sqlite3 database (more on this in a moment)
ActiveRecord::Base.establish_connection(
  :adapter  => 'sqlite3',
  :database => ':memory:'
)

# Create the minimal database schema necessary to reproduce the bug
ActiveRecord::Schema.define do
  create_table :users, :force => true do |t|
  end

  create_table :user_folders, :force => true do |t|
    t.integer :user_id
  end
end

# Create the minimal set of models to reproduce the bug
class User < ActiveRecord::Base
end

class UserFolder < ActiveRecord::Base
  belongs_to :user
end

# Create some test data
#
# If you're demonstrating an exception, then this is probably not necessary,
# but if your bug is to do with the wrong data being returned from the database,
# then you'll probably need some test data to show that.
user = User.create!
user_folder = UserFolder.create(:user => user)

# Reproduce the actual bug!
UserFolder.joins(:user).includes(:user) # => BOOM!