The Query usually does apply_labels automatically. if you are getting that
warning with your query below, there's too much going on there for me to
identify by sight where that might be happening, I would need actual code which
I can run in order to diagnose.
On May 10, 2013, at 11:10 AM, Ladislav Lenart <lenart...@volny.cz> wrote:
> Hello.
>
> I get a warning like this:
>
> usr/lib/python2.7/dist-packages/sqlalchemy/sql/expression.py:2276: SAWarning:
> Column 'id' on table <sqlalchemy.sql.expression.Select at 0xa3e19cc; Select
> object> being replaced by another column with the same key. Consider
> use_labels
> for select() statements.
>
> use_labels() or apply_labels() should help but both work only on the core
> constructs. How can I do this on a Query level?
>
> Also, can this alone cause a cartesian product in a query?
>
> My entire (recursive) query:
>
> def find_subtree(self, max_depth=None, eager=False):
> cls = self.__class__
> i0 = literal_column('1').label('max_depth')
> q_base = session.query(cls.id.label('partner_id'),
> i0).filter(cls.sponsor_id == self.id)
> q_cte = q_base.cte(name='q_cte', recursive=True)
> q_cte_alias = aliased(q_cte, name='q_cte_alias')
> partner_alias = aliased(cls, name='partner_alias')
> i1 = literal_column('max_depth + 1').label('max_depth')
> q_rec = session.query(partner_alias.id.label('partner_id'), i1)
> q_rec = q_rec.filter(partner_alias.sponsor_id ==
> q_cte_alias.c.partner_id)
> if max_depth is not None:
> q_rec = q_rec.filter(q_cte_alias.c.max_depth < max_depth)
> q_cte_union = q_cte.union_all(q_rec)
> if eager:
> q = session.query(cls, PersonalContact).select_from(q_cte_union)
> q = q.join(cls, cls.id == q_cte_union.c.partner_id)
> q = q.join(PersonalContact, cls.id == PersonalContact.partner_id)
> q = q.options(
> subqueryload_all(cls.partner_regions),
> joinedload_all(cls.personal_data, PersonalData.address,
> innerjoin=True),
> subqueryload_all(PersonalContact.contact_tags, ContactTag.tag),
> )
> else:
> q = session.query(cls)
> q = q.join(q_cte_union, cls.id == q_cte_union.c.partner_id)
> return q
>
>
> Thank you,
>
> Ladislav Lenart
>
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