On Nov 8, 2010, at 1:16 PM, Adrian wrote:
> Hi all,
>
> This is a topic that has been discussed before, but I haven't been
> able to successfully implement any of the proposed solutions in my own
> code. I've created a few Views in my postgres database, and I'm
> looking for a way to simply query them from sqlalchemy. I tried just
> treating them as tables, but this failed when the mapper wasn't able
> to find a primary key (makes sense).
>
> The code I tried was just a naive attempt:
>
> class SpectrumView(object):
> pass
>
> spectrum_view = Table('spectrum_view', metadata, autoload=True)
> mapper(SpectrumView, spectrum_view)
>
> So I read in some message that it might be possible to specify a
> primary key to the mapper, like
> mapper(SpectrumView, spectrum_view, primary_key=[..]), but the problem
> is I'm not defining my tables in python - they are already created, so
> I don't have any column objects to pass to primary_key.
The column objects are always available from table.c regardless of whether
autoload was used or not:
mapper(SpectrumView, spectrum_view, primary_key=[spectrum_view.c.somecolumn,
spectrum_view.c.someothercolumn])
>
> Anyway, I'm just curious to see if anyone has had success with an
> implementation of database views in sqlalchemy, and possibly examples
> of those cases.
>
> Thanks,
> Adrian
>
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