On Thu, Oct 26, 2017 at 6:32 AM, <[email protected]> wrote: > Hi, > > I am curious about this warning: > > /…/lib/python3.5/site-packages/sqlalchemy/orm/persistence.py:964: SAWarning: > DELETE statement on table '…' expected to delete 1 row(s); 0 were matched. > Please set confirm_deleted_rows=False within the mapper configuration to > prevent this warning. > (table.description, expected, rows_matched)
it means the ORM emitted a statement like: DELETE FROM your_table WHERE primary_key=<X> and then there was no row with "X". This is not supposed to happen, and is usually an indicator that ORM-level code is causing a delete of the same row more than once. Such as, emitting a DELETE statement and then also saying session.delete(some_object). You'd want to understand why this is happening and then if you identify it as an unavoidable situation, set up that flag. > > I found this Stackoverflow thread but it didn't give away mach information. > > The warning appears seemingly random, and I'm curious about its details. > Could somebody please shed light on it? I'm hesitant about silencing a > warning without understanding its cause(s). > > Thank you! > Jens > > -- > 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 [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
