On Oct 20, 2011, at 11:29 AM, Alex K wrote:
> Thanks!
>
> Very simple solve :)
>
> I just added:
> def content_comments_level_add(mapper, context, row, target, **flags):
> if mapper.class_ is Comment and 'AS level' in context.query.__str__():
> level = tuple(row)[-3]
> target.level = level
try doing:
"level" in row
instead of recompiling the query with __str__() each time, very expensive, also
not very accurate
>
>
>
> event.listen(mapper, 'populate_instance', content_comments_level_add)
>
> and it works.
>
> Thanks!
>
>
> On Thu, Oct 20, 2011 at 6:54 PM, Michael Bayer <mike...@zzzcomputing.com>
> wrote:
>
> On Oct 20, 2011, at 10:45 AM, Alex K wrote:
>
> > I solve this problem with new custom Query class:
>
> it appears all you're doing is injecting an extra column into the result.
> Still not clear why column_property() doesn't work here. There's also the
> populate_instance event which would allow you to inject code right into the
> load operation, given the "row" and "instance" you're looking for here:
> http://www.sqlalchemy.org/docs/orm/events.html#sqlalchemy.orm.events.MapperEvents.populate_instance
> .
>
>
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