Weird, I did try that but I can't seem to trigger it. Here's a self-contained test: https://gist.github.com/tonycosentini/4dee3478695d032ca67707b5e26739b6
I have the event listener set to just crash, but it never triggers. On Fri, Oct 20, 2023 at 9:20 PM Mike Bayer < mike_not_on_goo...@zzzcomputing.com> wrote: > > > On Fri, Oct 20, 2023, at 8:08 AM, 'Tony Cosentini' via sqlalchemy wrote: > > Hi, > > Is there any way to listen for an event for when a query result gets > merged into a pre-existing object in the session? > > > this is the refresh event: > > > https://docs.sqlalchemy.org/en/20/orm/events.html#sqlalchemy.orm.InstanceEvents.refresh > > > > I'm working on disabling autoflush for some of our codebase (mostly to cut > down on queries on a high QPS path), but before doing that I want to write > a utility to detect when we read data that was flushed via autoflush to cut > down on any potential bugs. > > What I'd like to do is this (while autoflush is still enabled): > > table_one = TableOne(name='test') > session.add(table_one) # Track this object as pending a flush via the > before_* listeners, this is working as expected. > > table_two_instances = session.query(TableTwo).all() # All good, doesn't do > anything with the table_one instance created earlier > > table_one_instances = session.query(TableOne).all() # I would like to log > a warning here as the results of this query depend on a flush happening. > What I'm hoping to do is detect that one of the rows coming back is the > same object that was flagged earlier, but I can't see to find the correct > event to use. > > > you probably want to also use refresh_flush also, which will be invoked > for column defaults that are populated on the object > > > https://docs.sqlalchemy.org/en/20/orm/events.html#sqlalchemy.orm.InstanceEvents.refresh_flush > > > > > > Is this possible? I can't seem to find the appropriate event that would > trigger when the results from the .all() query get merged back in with the > existing objects in the session. > > > that's the refresh event > > > -- > 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 a topic in the > Google Groups "sqlalchemy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sqlalchemy/9bevy3Kpql4/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sqlalchemy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/c5b89f67-e3fa-45f2-8774-463d154514f3%40app.fastmail.com > <https://groups.google.com/d/msgid/sqlalchemy/c5b89f67-e3fa-45f2-8774-463d154514f3%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. --- 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/CAEx_o%2BAhhUSPDYuGL4TFkTvxjHYfKEWUnBMxh2PzCDw3GJPaGg%40mail.gmail.com.
