if the original "q" is a select(), this should work:
query(MyClass, q.c.somecol, q.c.someothercol).from_statement(q)
if not then I guess I'll screw around with it to see what works.
On Apr 25, 2013, at 10:37 AM, Richard Gerd Kuesters <rich...@humantech.com.br>
wrote:
> Yup, I agree with you, but things are a little out of hand for me to use
> ORM-level queries. I'll see what I can do ...
>
> Thanks! :)
> Cheers,
> Richard.
>
> On 04/25/2013 11:31 AM, Michael Bayer wrote:
>> you'd need to organize things differently for the column grabbing to work
>> out.
>>
>> I'd advise producing the query using ORM-level Query in the first place so
>> that you don't need to use from_statement(), which is really a last resort
>> system.
>>
>>
>> On Apr 25, 2013, at 10:27 AM, Richard Gerd Kuesters
>> <rich...@humantech.com.br> wrote:
>>
>>> Well, not the desired result ... Now things justs blows :-)
>>>
>>> sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
>>> column 'anon_1.level'"
>>>
>>>
>>> Cheers,
>>> Richard.
>>>
>>>
>>> On 04/25/2013 11:03 AM, Michael Bayer wrote:
>>>> why not just say session.query(MyObj, q.alias()) ? creating ad-hoc
>>>> mappers is relatively expensive.
>>>>
>>>>
>>>>
>>>> On Apr 25, 2013, at 8:56 AM, Richard Gerd Kuesters
>>>> <rich...@humantech.com.br> wrote:
>>>>
>>>>> Well, probably nevermind because I made a workaround that satisfies me
>>>>> (may not be elegant, but that's OK).
>>>>>
>>>>> Basically, I created the "o" type a little different: "o =
>>>>> type('MyObjExt', (Base,), {'__table__':q.alias('q')})" and append it to
>>>>> the query like: "session.query(MyObj, o).from_statement(q).all()"
>>>>>
>>>>> Okay, now it returns a typle, but at least I don't have to make a second
>>>>> query :)
>>>>>
>>>>>
>>>>> Cheers,
>>>>> Richard.
>>>>>
>>>>> On 04/25/2013 09:41 AM, Richard Gerd Kuesters wrote:
>>>>>> Hi all,
>>>>>>
>>>>>> I've been playing with "sqla_hierarchy" from
>>>>>> https://github.com/marplatense/sqla_hierarchy .
>>>>>>
>>>>>> The problem is: the returned query appends 3 columns: level (Integer),
>>>>>> is_leaf (Boolean) and connect_path (pg ARRAY).
>>>>>>
>>>>>> So far, so good. If I execute the query using
>>>>>> "session.execute(q).fetchall()", it works like a charm. But, as we know,
>>>>>> "session.execute" returns a RowProxy, not objects. Using
>>>>>> "session.query(MyObj).from_statement(q).all()", I'm able to get my
>>>>>> mapped objects, but without the extra columns that would make me very
>>>>>> pleased (level, is_leaf, connect_path). Is there a way to get around
>>>>>> this?
>>>>>>
>>>>>> I have done testings using "o = type('MyObjExt', (MyObj,), {'__table__':
>>>>>> q}" and them use it on the session.query, *but* it looses foreign key
>>>>>> references - or, well, I don't know how to "explain" this to the mapper
>>>>>> (?), since MyObj is polymorphic (probably the pitfall?).
>>>>>>
>>>>>>
>>>>>> Thanks for your time and help.
>>>>>>
>>>>>> Best regards,
>>>>>> Richard.
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>>>>>
>>>>>
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