Hi, I have a simple setup that may be summarized as:
class User(Base): __tablename__ = 'user' name = Column(String(20), primary_key=True) class Mail(Base): __tablename__ = 'address' mail = Column(String(20), primary_key=True) user_name = Column(ForeignKey(User.name, ondelete="CASCADE"), nullable=False) the generated DDL allows deletion of a user also in case it has associated addresses thanks to the ON DELETE CASCADE. If I try to delete the object from sqlalchemy I get an error, since SA tries to set úser_name'attribute to NULL that is forbidden by the NOT NULL constraint. I can add a relation that will fix things by adding a backref: user = relation(User, backref=backref('addresses', cascade='all, delete- orphan')) Is there a way to obtain that any cascading is left to the backend? (pg in my case). I have not been able to find references but I'm sure I saw some discussion on that already... Thanks in advance sandro *:-) --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---