Hi, I use in my database tables, that reference other tables, e.g. table A -> table B. In my deletion routine, I want to prohibit people to delete rows from A, which have references to B.
How would I do that? My first approach was to rely on the databases referential integrity and catch related dabases errors, however, SQLAlchemy works around these references, as due to the "cascade = all" rule in the mapper, the rows of table "B" are simply deleted before. On the other hand, I can't simply omit "cascade=all", as I need this for object creation. "passive_deletes", "delete_orphan" and the like are also no solution. What I currently do is to manually check for related objects and raise an error if I find one, but I estimate that there will be some SQLAlchemy trick that does that for me? Best Regards, Hermann -- herm...@qwer.tk GPG key ID: 299893C7 (on keyservers) FP: 0124 2584 8809 EF2A DBF9 4902 64B4 D16B 2998 93C7 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
