On Jul 11, 2013, at 11:43 AM, Amir Elaguizy <[email protected]> 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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