On Friday, June 8, 2012 8:56:45 AM UTC-4, Michael Bayer wrote:
>
> How come you're making some kind of mapping to this new __select__, but
> then when you use query() you're not making this query towards the
> JoinSummary class ? the example seems a little torn as to what it wants to
> do.
>
Sorry, it was a typo... I do actually want to use
Session.query(JoinSummary).all()
(hand-typed from my non-programming computer), but since the table produced
the error, I tried with the *__select__*.
> The error means that the generated SQL contains a FROM leading to the name
> "summary" more than once.
>
> Basically the use case of deriving __table__ from AliasedClass, which
> would then be expected to be the "aliased" table, was never anticipated -
> aliased(orm_object) was only meant to produce a new class that itself was
> the "alias" object that can be used in a query. So __table__ is still the
> "summary" table here. It might not be a bad idea to change this.
> (though not mid-0.7, would be another 0.8 thing).
>
If printing the *Session.query()* with *orm.aliased(Summary, name='s1')*,
it seems to be ok, but using it with *sqlalchemy.select()*, it didn't work
anymore. No wonder why I was confused :)
But anyway yeah that's not really how I anticipated aliased(orm_object)
> being used. If you want to work with SQL Expression level aliases I'd
> build that directly:
>
> a1 = Summary.__table__.alias('summary1')
> a2 = Summary.__table__.alias('summary2')
>
> my_select = select(..)... etc
>
> result = session.execute(my_select)
>
Ok, I got it. And then I would simply use a1.c.myColumn in the rest of the
select(). Thanks for your help.
I would have though it would have been natural to do it that way...
Hopefully, my vision would get to improve the module...
D.
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