FactoryGirl associations failure

factory_girl_association_failure.rb

class User < ActiveRecord::Base
  attr_accessible :name
  has_one :address
end
class Address < ActiveRecord::Base
  attr_accessible :addr1, :addr2
  belongs_to :user
  validates_presence_of :user
end

FactoryGirl.define do
  factory :user do
    name "MyString"
    association :address
  end
  factory :address do
    addr1 "MyString"
    addr2 "MyString"
  end
end

FactoryGirl.create :user









FactoryGirl.define do
  factory :user do
    name "MyString"
    after(:build) do |user|
      user.address = FactoryGirl.build :address
    end
  end
end


FactoryGirl.create :user, :address => FactoryGirl.build(:address, :addr1 => "elm st")