[Rails] Factory Girl, Spork and Cucumber - duplicate model classes

I am having a strange problem with FactoryGirl, Spork and Cucumber.
It seems to be happening when on a 'before_validation' hook another
model object is created and saved.

Below is a cut down version of the model in question. When it is
created via FactoryGirl, I get this error:

Country(#28734490) expected, got Country(#28417320)
(ActiveRecord::AssociationTypeMismatch)

class TuteonParent < ActiveRecord::Base

has_one :address, :as => :addressable
has_one :fs_parent_profile

accepts_nested_attributes_for :fs_parent_profile, :address

validates_presence_of :address
validates_associated :address

validates_presence_of :core_profile
validates_associated :core_profile

validates_presence_of :fs_parent_profile
validates_associated :fs_parent_profile

before_validation :create_fs_parent_profile

def create_fs_parent_profile

fs_parent_profile = FsParentProfile.new(
:state => address.country.name,
:curriculum_state => address.country.name,
:country => address.country,
:fs_curriculum_country =>
FsCurriculumCountry.find_by_country_id(address.country.id)
)

self.fs_parent_profile = fs_parent_profile
end

... and the simplified Factory definition is as follows:

Factory.define :valid_parent, :class => Parent do |p|

tp.address { Factory.create(:address) }

end

If anyone can shed some light on this would be much appreciated!
Thank you

Adam

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