asd.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"
  # Activate the gem you are reporting the issue against.
  gem "activerecord", "5.1.0.rc1"
  gem "sqlite3"
end

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 :contents, force: true do |t|
  end

  create_table :tags, force: true do |t|
  end

  create_table :taggings, force: true do |t|
    t.references :taggable, polymorphic: true
    t.references :tag
  end
end

class Content < ActiveRecord::Base
end

class Tagging < ActiveRecord::Base
  belongs_to :taggable, polymorphic: true
  belongs_to :tag
end

class Tag < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_association_stuff
    Tagging.create! taggable: Content.create!, tag: Tag.create!
  end
end