bojanb wrote: > > I was under the impression that returning EXT_STOP in my > MapperExtension.before_insert() can prevent an object from being > inserted into the database altogether, but that doesn't seem to be > working, so I'm not sure if I'm misunderstanding the operation of > MapperExtensions or it's a bug.
it does not. http://www.sqlalchemy.org/docs/05/reference/orm/interfaces.html?highlight=mapperextension#sqlalchemy.orm.interfaces.MapperExtension "Returning EXT_STOP will halt processing of further extensions handling that method." that only refers to additional extensions. > > I'd like to have objects with (non-mapped) attribute "temporary" set > to True not be written to the database, because they haven't been > fully initialized yet (e.g. some of their fields would violate > integrity constraints). > > And before you say "simply don't add them to the session until they > have been initialized" - they get added automatically because of > backrefs. turn off cascade on those backrefs: 'foo':relation(Bar, backref=backref('foos', cascade=None)) --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
