if you add a column to a Query that was returning an object, like Data, you
will get back tuples of (Data, extra_col). this is probably what the tool you
are using is complaining about.
On Fri, Apr 14, 2023, at 10:51 PM, Mike Bayer wrote:
>
>
> On Tue, Apr 11, 2023, at 9:17 PM, Luis Del Rio IV wrote:
>> The sql query itself returns several rows, as it should. But when trying to
>> combine the max using sqlalchemy the rows return as the following.
>>
>> Received incompatible instance \"(<server.db.models.Data object at
>> 0x7f2c6cfd6670>, '2021-04-10 18', Decimal('7294.00000'))\".",
>
> that's not a SQLAlchemy error. I would again suggest you get help from the
> maintainers of the library you're using.
>
>
>
>>
>> Here I am able to get the max for that row group, but am unable to pass it
>> into the DataModel object
>>
>> On Tuesday, April 11, 2023 at 4:59:15 PM UTC-7 S Mahabl wrote:
>>> Do you get many rows?
>>>
>>> SELECT date_format(data.timestamp, "%Y-%m-%d %H"), max(data.value) AS
>>> data_value
>>> from data
>>> GROUP BY date_format(data.timestamp, "%Y-%m-%d %H")
>>> On Tue, Apr 11, 2023 at 4:24 PM Luis Del Rio IV <lu...@colovore.com> wrote:
>>>> Hello,
>>>>
>>>> I am currently using the following sqlalchemy code,
>>>>
>>>> _query = super().get_query(model, info, sort, **args)
>>>> query = _query.group_by(
>>>> func.date_format(DataModel.timestamp, "%Y-%m-%d %H")
>>>> )
>>>> return query
>>>>
>>>> I am trying to aggregate the the max value of a field from DataModel.value
>>>> utilizing the group by clause.
>>>>
>>>> In simple sql, you would do the following.
>>>>
>>>> SELECT max(data.value) AS data_value
>>>> from data
>>>> GROUP BY date_format(data.timestamp, "%Y-%m-%d %H")
>>>>
>>>> What would the proper way to express this? The various methods I have
>>>> tried somehow overwrite the original query and do not map to our
>>>> attributes.
>>>>
>>>>
>>>> --
>>>> SQLAlchemy -
>>>> The Python SQL Toolkit and Object Relational Mapper
>>>>
>>>> http://www.sqlalchemy.org/
>>>>
>>>> To post example code, please provide an MCVE: Minimal, Complete, and
>>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
>>>> description.
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>>>>
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>>
>>
>> --
>> SQLAlchemy -
>> The Python SQL Toolkit and Object Relational Mapper
>>
>> http://www.sqlalchemy.org/
>>
>> To post example code, please provide an MCVE: Minimal, Complete, and
>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
>> description.
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>>
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>
>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
> ---
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>
> <https://groups.google.com/d/msgid/sqlalchemy/ee62e370-b0c1-4656-95e2-4ecbcf4791e7%40app.fastmail.com?utm_medium=email&utm_source=footer>.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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