Fabricator(:asset) do
end

Fabricator(:photo, :from => :asset, :class_name => :photo) do
  user!
  category!
  title { Faker::Lorem.words }
  description { Faker::Lorem.paragraphs }
  after_build do |asset|
    asset.previews << Fabricate(:preview, :asset => asset)
    asset.products << Fabricate(:product, :asset => asset)
  end
end

Fabricator(:preview) do
#  asset_id { Fabricate([:brush, :pattern, :photo, :texture].sample) }
  upload { File.open("#{Rails.root}/spec/media/factory.png") }
end

# Test error:
#     Failure/Error: get :new, :asset_id => Fabricate(:photo).permalink
#     SQLite3::ConstraintException: previews.asset_id may not be NULL: INSERT INTO "previews" ("asset_id", "created_at", "updated_at", "upload") VALUES (NULL, '2011-03-28 18:46:12.517251', '2011-03-28 18:46:12.517251', 'factory.

# Also tried, but got same error:
    asset.previews << Fabricate(:preview, :asset_id => asset.id)
    asset.products << Fabricate(:product, :asset_id => asset.id)