Re: [sqlalchemy] Re: Trying to find a way to sort a query given the name of one of its columns
On Mon, Jun 12, 2023, at 3:12 AM, Lele Gaifax wrote: > Lele Gaifax writes: > >> I will study the contains_eager() alternative and try to modernize my >> code that still uses that idiom. > > After reading the different sections (narrative and reference), I wonder > if there is a case where the joinedload() has some advantage over > contains_eager(), or if the former, being "the oldest style of eager > loading in SA ORM" is kept mainly for backward compatibility. joinedload() is a lot easier to use for sure and yes there are probably some very nested/ crazyish cases where joinedload "works" and contains_eager either doesnt quite work or is very difficult to make it work. > > bye, lele. > -- > nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri > real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia. > l...@metapensiero.it | -- 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. > --- > You received this message because you are subscribed to the Google > Groups "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to sqlalchemy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/87r0qh9mrs.fsf%40metapensiero.it. -- 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. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/cc58ebb7-6489-4e05-8d21-18bd68b91933%40app.fastmail.com.
[sqlalchemy] Re: Trying to find a way to sort a query given the name of one of its columns
Lele Gaifax writes: > I will study the contains_eager() alternative and try to modernize my > code that still uses that idiom. After reading the different sections (narrative and reference), I wonder if there is a case where the joinedload() has some advantage over contains_eager(), or if the former, being "the oldest style of eager loading in SA ORM" is kept mainly for backward compatibility. bye, lele. -- nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia. l...@metapensiero.it | -- 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. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/87r0qh9mrs.fsf%40metapensiero.it.
[sqlalchemy] Re: Trying to find a way to sort a query given the name of one of its columns
Federico Caselli writes:
> Also you may not need the col_by_name at all for order_by, since you can
> pass the string in order_by directly:
> https://docs.sqlalchemy.org/en/20/tutorial/data_select.html#tutorial-order-by-label
> This case is still not supported, since doing "query.order_by('firstname')"
> raises "column not found".
Yes, but in rare cases I exploited its ability of findind a column not
"exposed" in the select, belonging to one of the joined tables, for
example to have a stable sort.
> (ps: github discussions should be preferred to share code snippets)
Sorry, note taken.
ciao, lele.
--
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
l...@metapensiero.it | -- 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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