On Feb 16, 2008 7:30 AM, Thomas Wittek <[EMAIL PROTECTED]> wrote:
>
> Hi!
>
> I'm trying to filter my data by some date calculations.
> In detail, I want to filter out messages that have been marked as
> "deleted" more than 30 days ago.
>
> In a query I could do it like this:
>
> threshold = datetime.now() - datetime.timedelta(30)
> return Message.query().filter(Message.deleted > threshold).all()
>
> But how can I do it in a relation() that returns all deleted messages?
> I'd have to calculate the threshold on every call to the relation or
> I'd have to create a query that will do the calculation in SQL.
> For both options I don't know how I could accomplish it.
>
> messages_deleted=relation(
> Message,
> primaryjoin=and_(<conditions to create the relation>,
> message_table.c.deleted > ????),
> ),
>
> Any ideas?
interesting question. I know it can be done with the function sql
method, but since ansi and rdbms are exclusive of each others the
actual portable code will be a mess.
in mysql u could get away with something like this.
>>> from sqlalchemy.sql import func
func.datediff(bindparam('now',bindparam('before'))
^^^ not tested
> >
>
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