Rails 4.0->4.1 failure

gistfile1.txt

# Activate the gem you are reporting the issue against.
#gem 'activerecord', '~>4.0.0'
#gem 'activesupport', '~>4.0.0'
#gem 'activerecord', '~>4.0.0'
#gem 'railties', '~>4.0.0'
gem 'actionpack', '~>4.1.0'
gem 'activesupport', '~>4.1.0'
gem 'activerecord', '~>4.1.0'
gem 'railties', '~>4.1.0'
gem 'sqlite3'
gem 'multi_json'
gem 'tzinfo'
gem 'shoulda'
gem 'rspec-rails'
gem 'shoulda-matchers'
require 'active_record'
require 'logger'
require 'pry'
 
# rspec configuration
RSpec.configure do |config|
  config.color_enabled = true
  config.tty = true
  config.formatter = :documentation
end


 
# 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 :item_request_notifications do |t|
    t.integer :notification_id
    t.string :request
  end
 
  create_table :notifications do |t|
    t.string :message_type
    t.integer :recipient_id
  end

  create_table :users do |t|
    t.string :name
  end
end

class User < ActiveRecord::Base
  has_many :notifications, :foreign_key => :recipient_id
end

class Notification < ActiveRecord::Base
  belongs_to :recipient, :class_name => User.name, :inverse_of => :notifications, :touch => true
  has_one :item_request_notification, :inverse_of => :notification, :dependent => :delete
  validates :recipient, :presence => true
end

module NotificationMessage
  extend ActiveSupport::Concern

  included do
    belongs_to :notification, :autosave => true, :inverse_of => name.underscore.to_sym, :dependent => :destroy
    delegate :message_type, :recipient, :recipient=, :to => :notification
  end

  def notification
    super || build_notification(:message_type => "whatever")
  end
end


class ItemRequestNotification < ActiveRecord::Base
  include NotificationMessage

  validates :notification, :recipient, :presence => true

  belongs_to :item_request, :inverse_of => :notifications
end


describe ItemRequestNotification do
  let(:user) { User.create(:name => "Jane") }

  describe "creation" do
    subject(:irn) { ItemRequestNotification.create!(:recipient => user, :request => "whatever2") }

    its(:recipient) { should == user }
    its(:request) { should == "whatever2" }
    its(:message_type) { should == 'whatever' }
    its(:notification) { should_not be_nil }
  end
end