The answers regarding "cascade" are correct, however this question has been asked a few times before and we have a recipe on the Wiki that discusses this problem and presents an ORM event oriented solution, which is at https://github.com/sqlalchemy/sqlalchemy/wiki/ManyToManyOrphan , which I put up after answering this question on stackoverflow a few times. It also seems to state that SQLAlchemy-utils includes such a feature, which is probably based on this recipe, that's at https://sqlalchemy-utils.readthedocs.io/en/latest/listeners.html#many-to-many-orphan-deletion and maybe that works too.
this is kind of old-ish stuff so i haven't tested it recently to see if things are up to date but the basic idea should still be working. On Tue, Nov 2, 2021, at 4:49 PM, Anders Buch wrote: > Hello All, > > Suppose I have a table of people, a table of secrets, and a many-to-many > association table between them. A person can exist without knowing any > secrets, but a secret without any associated people might as well be deleted. > My reading of the documentation is that it is not possible to set cascade > options to obtain this behavior? (Because a cascade delete option would cause > a secret to be deleted if any person forgets about it?) If correct, is there > another elegant way to achieve this? > > Thanks in advance! > Anders Buch > > > > -- > 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/b5e4faee-5cd6-4b9b-936b-0d80458f55e4n%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/b5e4faee-5cd6-4b9b-936b-0d80458f55e4n%40googlegroups.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/328beb56-2edf-417d-8593-1fb277a81929%40www.fastmail.com.
