in rails, have has_one association
class car has_one :driver end when do
driver = driver.new car.driver = driver it tries save driver before i'm ready! want save driver when call car.save
how can have rails 4.2.* change order of saving?
i'm pretty sure doesn't persist changes database. see in memory.
car.driver = driver car.driver == driver # true car.reload car.driver == dirver # false 