Factory.define :post do |p|
  p.sequence(:text)  { |n| "Post #{ n }" }
  p.author_id { Factory(:friend).receiver.id }
  p.owner_id  { |q| Actor.find(q.author_id).received_ties.first.sender.id }
  p.user_author_id { |q| q.author_id }
end

Factory.define :public_post, :parent => :post do |p|
  p.owner_id  { |q| q.author_id }
  p._relation_ids { |q| Array(q.author.relation_public.id) }
end