ActiveRecord validates_associated Issue in Rails 3.2.9

condensed.rb

#!/usr/bin/env ruby1.9.1

require 'rubygems'
gem 'rails', '3.2.9'
gem 'sqlite3'

require "active_record/railtie"
require "active_resource/railtie"

ActiveRecord::Base.logger = Logger.new STDOUT

module Vatest
  class Application < Rails::Application
  end
end

ENV['DATABASE_URL'] = 'sqlite3://localhost/db.sqlite3'
Vatest::Application.configure do
  config.cache_classes = false
  config.whiny_nils = true
  config.active_support.deprecation = :log
  config.class.send :define_method, :database_configuration do 
    nil
  end
end

Vatest::Application.initialize!


class Author < ActiveRecord::Base

  has_many :books

  validates :name, :presence => true, :uniqueness => true

end

class Book < ActiveRecord::Base

  belongs_to :author

  validates :title, :presence => true, :uniqueness => { :scope => :author_id }
  validates :author_id, :presence => true
  validates_associated :author

end

class CreateAuthors < ActiveRecord::Migration
  def change
    create_table :authors do |t|
      t.string :name, :null => false
    end
    add_index :authors, :name, :unique => true
  end
end

class CreateBooks < ActiveRecord::Migration
  def change
    create_table :books do |t|
      t.references :author, :null => false
      t.string :title, :null => false
    end
    add_index :books, [ :author_id, :title ], :unique => true
  end
end


to_eval = [
  'CreateAuthors.migrate(:up) if !Author.table_exists?',
  'CreateBooks.migrate(:up) if !Book.table_exists?',
  'Author.destroy_all',
  'Book.destroy_all',
  '$b = Book.new(:title => "Testing 1.2.3...", :author_id => Math::PI * 1000)',
  '$b.valid?',
  '$b.save',
  '$b.reload',
  '$b.valid?'
]

to_eval.each do |rb|
  print "# " + rb + "\n"
  print "==> " + eval(rb).inspect + "\n"
end