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'))\".",
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 <[email protected]>
> 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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>> .
>>
>
--
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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