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
*:-)
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