On Fri, Oct 23, 2020, at 8:30 PM, ai.rese...@gmail.com wrote:
>
> Hi all
>
> I want to update a table row once I create a new row in another table. These
> 2 tables are in the same database, but no relationship between them
>
> I use "before_insert" listener for the first table. In this function, I load
> the target object instance from the second table and try to update it. After
> update, if I flush the session, I got this error that the session is already
> flushing which is reasonable. On the other hand, if I don't flush the
> session, the change on the second table is not applied. I appreciate your
> kind advice on this issue.
So I would imagine you'd want to use the "after_insert" event here since you
want to update this row *after* you created the other new row.
when you're in before_insert /after_insert etc., there's a Connection there,
emit Core update statements on that. you can't perform session persistence
operations inside of these functions.
connection.execute(target_table.update().where(target_table.c.id ==
<id>).values(foo='bar'))
>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
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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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