On Oct 17, 2013, at 6:34 AM, Victor Varvariuc <victor.varvar...@gmail.com> wrote:
> I have a model:
>
> class ExchangeRate(Base):
> ...
> created_at = Column(DateTime, nullable=False, server_default=func.now())
> updated_at = Column(DateTime, nullable=False, server_default=func.now(),
> server_onupdate=func.now())
>
> Model fields `created_at` and `updated_at` have values generated by server,
> but the value is not fetched automatically:
>
> 14 with Session() as session:
> ---> 15 return session.merge(exchange_rate)
> 16
>
> ipdb> exchange_rate
> ExchangeRate(currency_from='RUB', currency_to='KZT', rate=Decimal('4.77'),
> rounding_type='FLOOR', rounding_precision=-2)
> ipdb> session.merge(exchange_rate)
> ExchangeRate(currency_from='RUB', currency_to='KZT', rate=Decimal('4.77'),
> rounding_type='FLOOR', rounding_precision=-2)
> ipdb>
>
> Do I do use it correctly?
if the question is, why don't you see created_at, updated_at, those would go in
when the object is flushed, and then you'd only see them on the instance if you
access them first, as server-generated defaults aren't automatically fetched
back during flush (an improved "eager_defaults" feature in 0.9 makes this
feasible, however:
http://docs.sqlalchemy.org/en/latest/changelog/migration_09.html#orm-can-efficiently-fetch-just-generated-insert-update-defaults-using-returning).
>
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