Rails - Jan 2010 - factory_girl: build associated object

I am using factory girl to build the following objects: user and
blog.  A user has one blog.  A blog belongs to a user.

When I do the following

Factory.define :user do |u|
  u.association :blog
end

I get this error: Mysql::Error: Column ''user_id'' cannot be
null: .  I
suspect that is because factory tries to build a blog before it saves
the associated user object.  I am getting around this problem by
creating the associated blog in the steps file:

Given /^"([^\"]*)" is a screen name of a user$/ do
|user_screen_name|
  user = User.find_by_screen_name(user_screen_name)
  if user.nil?
     user =  Factory.create(:user, :screen_name => user_screen_name)
     Factory.create(:blog, :user_id => user.id)
  end
end

This works but I don''t think it''s very elegant.  What do you
think?
Thanks.

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