On Jul 27, 2010, at 1:23 PM, Zippy P wrote:
> Hi all,
>
> I have the following:
>
> class Device(Base):
> ...
> source_id = Column(BigInteger, primary_key=True)
> ...
>
> class EventQuery(Query):
> def custommethod():
> ...
>
> class Event(Base):
> __tablename__ = 'events'
> query = Session.query.property(query_cls = EventQuery)
> ...
> device_source_id = Column(BigInteger, ForeignKey("Device.source_id"))
> device = relationship(Device, backref=backref('events', lazy='dynamic'))
> ...
>
> Now, Device.events returns a query of type AppenderQuery, which is fine for
> some built-in methods like count() and all(). What I really need is for this
> to be a query of type EventQuery, so I can call Device.events.custommethod().
>
> 1) Is it possible to coerce AppenderQuery into a different Query class?
> 2) If not, is it appropriate to create a custom property on Device that will
> return an EventQuery containing the equivalent query, or is there a more
> proper way to do it?
relationship() and backref() accept query_class for this purpose.
>
> Thanks,
>
> S.
>
>
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