On Apr 7, 2011, at 11:07 AM, Aleksander Siewierski wrote:
>
> Hi, in part of my model I have a TaskIntro item and RedirectRule item
> connected with relation one-to-one one-sided, mapper for TaskIntro
> looks like:
>
> mapper(
> TaskIntro,
> table,
> version_id_col = table.c.version ,
> properties={
> ...
> 'redirect_rule': relation( RedirectRule,
> cascade="all, delete",
> primaryjoin=table.c.redirect_rule_id ==
> redirect_rule_t.c.id
> ),
> ...
> }
>
> and when I call method that get TaskIntro defined:
> def _get_all_query(self, **kwargs):
> query = self.query.options(
> contains_eager('redirect_rule'),
> eagerload_all('redirect_rule.periods'),
> eagerload('redirect_rule.channels'),
> ...
> )
> return query
>
> I receive following warning:
> /usr/lib/python2.6/dist-packages/sqlalchemy/orm/mapper.py:2113:
> SAWarning: Multiple rows returned with uselist=False for eagerly-
> loaded attribute 'TaskIntro.redirect_rule'
> populator(state, dict_, row)
>
> I'm googling about this warning, but have no idea what this can mean.
> How can multiple rows be returned here?
You didn't put a full example or the query you're using so its impossible to
give a specific answer. But it means the way you're joining from TaskIntro to
RedirectRule in your query is incorrect such that multiple RedirectRule rows
are being returned corresponding to a single TaskIntro identity.
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