Hi.
As the warning mebtions, the issue is that you are using the string name
with load only instead of the column from the class.
In this load only from the file:
.load_only('firstname')))
On Thursday, 15 July 2021 at 14:28:29 UTC+2 Mike Bayer wrote:
> i can look later, if i forget after a day or so please post this to github
> discussions and/or issues where i will notice it better
>
> On Thu, Jul 15, 2021, at 7:44 AM, Lele Gaifax wrote:
>
> Hi,
>
> while upgrading one of my apps to SA 1.4, paying attention toward 2.0
> compatibility, I found one single issue that I was not able to figure out
> whether I'm doing something wrong or missed something in the excellent
> migration guide.
>
> All tests pass, but executing them with SQLALCHEMY_WARN_20 I noticed the
> following message:
>
> RemovedIn20Warning: Using strings to indicate column or relationship
> paths
> in loader options is deprecated and will be removed in SQLAlchemy 2.0...
>
> It was not so simple to isolate the culprit code, but I eventually found
> the
> cause: here and there my app uses the load_only() option to load a subset
> of
> the columns of related entities, and that's what upsets the compatibily
> check.
>
> I'm attaching below a simple script that exhibits the problem (when
> executed
> with SQLALCHEMY_WARN_20=1).
>
> The documentation[1] shows a very similar usage, so I'm not sure where's
> the
> problem. Maybe using joinedload(X.y).load_only(a, b), a and b cannot be
> column
> names under 2.0, but should be Y.a and Y.b instead?
>
> Thanks a lot for any hint,
> ciao, lele.
>
> [1]
> https://docs.sqlalchemy.org/en/14/orm/query.html#sqlalchemy.orm.Load.load_only
>
> --
> 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
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>
>
> --
> nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
> real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
> [email protected] | -- Fortunato Depero, 1929.
>
> --
> 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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> .
>
>
> *Attachments:*
>
> - test.py
>
>
>
--
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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