Michael,
Thanks for the reply. I understand what you're saying and can go search for
that. I wonder if you could take a look at my question about join order
determinism in polymorphic queries?
Thanks,
Amir
On Thursday, July 11, 2013 11:09:50 AM UTC-7, Michael Bayer wrote:
>
>
> On Jul 11, 2013, at 11:43 AM, Amir Elaguizy <aela...@gmail.com<javascript:>>
> wrote:
>
> > If I do a query like this:
> >
> > return PcpPostModel.query.filter_by(id=post_id).options(
> > FromCache("default")
> > )
> >
> > and then later I do another query like this:
> >
> > PcpPostModel.query.options(FromCache("default")).all()
> >
> > Any models that were returned by the first query are now of type: <class
> 'dogpile.cache.api.CachedValue'>
>
> CachedValue is a tuple-based container that contains the actual result you
> want to work with as well as the time that the value was placed in the
> cache. Take a look at the contents of CachedValue.
>
> >
> > So then when the second query runs it will except with:
> >
> > File
> "/Users/aelaguiz/workspace/stufff/venv/lib/python2.7/copy_reg.py", line 70,
> in _reduce_ex
> > raise TypeError, "can't pickle %s objects" % base.__name__
> > TypeError: can't pickle function objects
> >
> > Any idea what I can do about this?
>
> something in your model class, or your mapping, or perhaps within some
> SQLAlchemy construct in use, is a callable function that isn't picklable.
> SQLAlchemy itself goes through a lot of trouble to not embed functions in
> mapped instances, however in some cases it's difficult to avoid. You'd
> need to provide full detail on your classes/mappings, most preferably a
> fully contained, runnable example, in order to determine where this
> callable is present.
>
>
>
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