issue_10197.rb

unless File.exists?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'sqlite3'
  GEMFILE
 
  system 'bundle'
end
 
require 'bundler'
Bundler.setup(:default)
 
require 'active_record'
require 'minitest/autorun'
require 'logger'
 
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)
 
ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.references :resource, polymorphic: true, index: true
    t.timestamps
  end

  create_table :things do |t|
    t.timestamps
  end
end
 
class Post < ActiveRecord::Base
  belongs_to :resource, :polymorphic => true, :counter_cache => true, touch: true
end
 
class Thing < ActiveRecord::Base
end

 
class BugTest < MiniTest::Unit::TestCase
  def test_all
    Post.all
  end
end